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PYSEC-2021-19
Vulnerability from pysec - Published: 2021-03-21 05:15 - Updated: 2021-03-30 18:47
VLAI
Details
An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Impacted products
| Name | purl | lxml | pkg:pypi/lxml |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "lxml",
"purl": "pkg:pypi/lxml"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "a5f9cb52079dc57477c460dbe6ba0f775e14a999"
}
],
"repo": "https://github.com/lxml/lxml",
"type": "GIT"
},
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.6.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9",
"0.9.1",
"0.9.2",
"1.0.beta",
"1.0",
"1.0.1",
"1.0.2",
"1.0.3",
"1.0.4",
"1.1alpha",
"1.1beta",
"1.1",
"1.1.1",
"1.1.2",
"1.2",
"1.2.1",
"1.3beta",
"1.3",
"1.3.1",
"1.3.2",
"1.3.3",
"1.3.4",
"1.3.5",
"1.3.6",
"2.0alpha1",
"2.0alpha2",
"2.0alpha3",
"2.0alpha4",
"2.0alpha5",
"2.0alpha6",
"2.0beta1",
"2.0beta2",
"2.0",
"2.0.1",
"2.0.2",
"2.0.3",
"2.0.4",
"2.0.5",
"2.0.6",
"2.0.7",
"2.0.8",
"2.0.9",
"2.0.10",
"2.0.11",
"2.1alpha1",
"2.1beta1",
"2.1beta2",
"2.1beta3",
"2.1",
"2.1.1",
"2.1.2",
"2.1.3",
"2.1.4",
"2.1.5",
"2.2alpha1",
"2.2beta1",
"2.2beta2",
"2.2beta3",
"2.2beta4",
"2.2",
"2.2.1",
"2.2.2",
"2.2.3",
"2.2.4",
"2.2.5",
"2.2.6",
"2.2.7",
"2.2.8",
"2.3alpha1",
"2.3alpha2",
"2.3beta1",
"2.3",
"2.3.1",
"2.3.2",
"2.3.3",
"2.3.4",
"2.3.5",
"2.3.6",
"3.0",
"3.0.1",
"3.0.2",
"3.1beta1",
"3.1.0",
"3.1.1",
"3.1.2",
"3.2.0",
"3.2.1",
"3.2.2",
"3.2.3",
"3.2.4",
"3.2.5",
"3.3.0beta1",
"3.3.0beta2",
"3.3.0beta3",
"3.3.0beta4",
"3.3.0beta5",
"3.3.0",
"3.3.1",
"3.3.2",
"3.3.3",
"3.3.4",
"3.3.5",
"3.3.6",
"3.4.0",
"3.4.1",
"3.4.2",
"3.4.3",
"3.4.4",
"3.5.0b1",
"3.5.0",
"3.6.0",
"3.6.1",
"3.6.2",
"3.6.3",
"3.6.4",
"3.7.0",
"3.7.1",
"3.7.2",
"3.7.3",
"3.8.0",
"4.0.0",
"4.1.0",
"4.1.1",
"4.2.0",
"4.2.1",
"4.2.2",
"4.2.3",
"4.2.4",
"4.2.5",
"4.2.6",
"4.3.0",
"4.3.1",
"4.3.2",
"4.3.3",
"4.3.4",
"4.3.5",
"4.4.0",
"4.4.1",
"4.4.2",
"4.4.3",
"4.5.0",
"4.5.1",
"4.5.2",
"4.6.0",
"4.6.1",
"4.6.2"
]
}
],
"aliases": [
"CVE-2021-28957",
"GHSA-jq4v-f5q6-mjqq"
],
"details": "An XSS vulnerability was discovered in python-lxml\u0027s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.",
"id": "PYSEC-2021-19",
"modified": "2021-03-30T18:47:00Z",
"published": "2021-03-21T05:15:00Z",
"references": [
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "FIX",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "ADVISORY",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
}
]
}
BREW-ANIMDL-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-09-09 23:40 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@5.3.1",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "animdl",
"purl": "pkg:brew/animdl"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.27_5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@5.3.1",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "5.3.1"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-animdl-CVE-2021-28957",
"modified": "2026-09-09T23:40:59Z",
"published": "2026-08-13T16:35:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-ANSIBLE-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-09-10 18:51 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.1.3",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "ansible",
"purl": "pkg:brew/ansible"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "14.3.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.1.3",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.1.3"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-ansible-CVE-2021-28957",
"modified": "2026-09-10T18:51:05Z",
"published": "2026-08-13T16:35:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-ANSIBLE@10-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-09-09 23:41 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.0.2",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "ansible@10",
"purl": "pkg:brew/ansible%4010"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "10.7.0_6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.0.2",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.0.2"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-ansible@10-CVE-2021-28957",
"modified": "2026-09-09T23:41:05Z",
"published": "2026-08-13T16:35:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-ANSIBLE@12-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-09-09 23:41 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.0.2",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "ansible@12",
"purl": "pkg:brew/ansible%4012"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "12.3.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.0.2",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.0.2"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-ansible@12-CVE-2021-28957",
"modified": "2026-09-09T23:41:06Z",
"published": "2026-08-13T16:35:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-ANSIBLE@13-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-09-10 18:51 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.1.1",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "ansible@13",
"purl": "pkg:brew/ansible%4013"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "13.8.0_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.1.1",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.1.1"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-ansible@13-CVE-2021-28957",
"modified": "2026-09-10T18:51:29Z",
"published": "2026-08-13T16:35:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-ANSIBLE@9-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-09-09 23:41 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.0.2",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "ansible@9",
"purl": "pkg:brew/ansible%409"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "9.13.0_4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.0.2",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.0.2"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-ansible@9-CVE-2021-28957",
"modified": "2026-09-09T23:41:06Z",
"published": "2026-08-13T16:35:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-APKLEAKS-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:35 – Updated: 2026-09-09 23:41 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.1.1",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "apkleaks",
"purl": "pkg:brew/apkleaks"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.6.3_3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.1.1",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.1.1"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-apkleaks-CVE-2021-28957",
"modified": "2026-09-09T23:41:33Z",
"published": "2026-08-13T16:35:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-AWS-GOOGLE-AUTH-CVE… (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:37 – Updated: 2026-09-18 15:00 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.1.3",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "aws-google-auth",
"purl": "pkg:brew/aws-google-auth"
},
"ranges": [
{
"events": [
{
"introduced": "0.0.31"
},
{
"fixed": "0.0.37_3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.1.3",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.1.3"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-aws-google-auth-CVE-2021-28957",
"modified": "2026-09-18T15:00:27Z",
"published": "2026-08-13T16:37:01Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-BAZARR-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:37 – Updated: 2026-09-15 08:48 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.1.3",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "bazarr",
"purl": "pkg:brew/bazarr"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.0_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.1.3",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.1.3"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-bazarr-CVE-2021-28957",
"modified": "2026-09-15T08:48:06Z",
"published": "2026-08-13T16:37:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
BREW-BBOT-CVE-2021-28957 (GHSA-JQ4V-F5Q6-MJQQ)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:37 – Updated: 2026-09-09 23:43 – Source website
VLAI
Summary
lxml vulnerable to Cross-Site Scripting
Details
An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "lxml",
"resource_purl": "pkg:pypi/lxml@6.1.2",
"upstream_fixed_in": "4.6.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "bbot",
"purl": "pkg:brew/bbot"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/lxml@6.1.2",
"name": "lxml",
"resource": "lxml",
"strategy": "registry",
"subject_version": "6.1.2"
}
]
},
"details": "An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.",
"id": "BREW-bbot-CVE-2021-28957",
"modified": "2026-09-09T23:43:32Z",
"published": "2026-08-13T16:37:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d"
},
{
"type": "WEB",
"url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-4880"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20210521-0004"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202208-06"
},
{
"type": "WEB",
"url": "https://pypi.org/project/lxml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxml/lxml"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
},
{
"type": "WEB",
"url": "https://bugs.launchpad.net/lxml/+bug/1888153"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
}
],
"summary": "lxml vulnerable to Cross-Site Scripting ",
"upstream": [
"GHSA-jq4v-f5q6-mjqq",
"CVE-2021-28957",
"PYSEC-2021-19"
]
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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