gsd-2021-28957
Vulnerability from gsd
Modified
2023-12-13 01:23
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.
Aliases
Aliases
{
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"alias": "CVE-2021-28957",
"description": "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": "GSD-2021-28957",
"references": [
"https://www.suse.com/security/cve/CVE-2021-28957.html",
"https://www.debian.org/security/2021/dsa-4880",
"https://access.redhat.com/errata/RHSA-2021:4162",
"https://access.redhat.com/errata/RHSA-2021:4160",
"https://access.redhat.com/errata/RHSA-2021:4158",
"https://access.redhat.com/errata/RHSA-2021:4151",
"https://access.redhat.com/errata/RHSA-2021:3254",
"https://ubuntu.com/security/CVE-2021-28957",
"https://advisories.mageia.org/CVE-2021-28957.html",
"https://security.archlinux.org/CVE-2021-28957",
"https://linux.oracle.com/cve/CVE-2021-28957.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
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"id": "GSD-2021-28957",
"modified": "2023-12-13T01:23:29.440267Z",
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"description": "lxml allows XSS. It places the HTML action attribute into `defs.link_attrs` (in `html/defs.py`) for later use in input sanitization, but does not do the same for the HTML5 formaction attribute.",
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"pubdate": "2021-03-21",
"solution": "Upgrade to version 4.6.3 or above.",
"title": "Cross-site Scripting",
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"lastModifiedDate": "2022-12-09T18:15Z",
"publishedDate": "2021-03-21T05:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.