FKIE_CVE-2020-27783

Vulnerability from fkie_nvd - Published: 2020-12-03 17:15 - Updated: 2026-06-17 03:09
Severity
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.
References
secalert@redhat.comhttps://advisory.checkmarx.net/advisory/CX-2020-4286Exploit, Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1901633Exploit, Issue Tracking, Patch, Third Party Advisory
secalert@redhat.comhttps://lists.debian.org/debian-lts-announce/2020/12/msg00028.htmlMailing List, Third Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL/
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK/
secalert@redhat.comhttps://security.netapp.com/advisory/ntap-20210521-0003/Third Party Advisory
secalert@redhat.comhttps://www.debian.org/security/2020/dsa-4810Third Party Advisory
secalert@redhat.comhttps://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://advisory.checkmarx.net/advisory/CX-2020-4286Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1901633Exploit, Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2020/12/msg00028.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK/
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210521-0003/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2020/dsa-4810Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
Impacted products
Vendor Product Version
lxml lxml *
redhat software_collections -
redhat enterprise_linux 8.0
debian debian_linux 9.0
debian debian_linux 10.0
fedoraproject fedora 32
fedoraproject fedora 33
netapp snapcenter -
oracle communications_offline_mediation_controller 12.0.0.3.0
oracle zfs_storage_appliance_kit 8.8
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "python-lxml",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "lxml-4.6.2"
            }
          ]
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
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              "versionEndExcluding": "4.6.2",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A XSS vulnerability was discovered in python-lxml\u0027s clean module. The module\u0027s parser didn\u0027t properly imitate browsers, which caused different behaviors between the sanitizer and the user\u0027s page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 una vulnerabilidad de tipo XSS en el m\u00f3dulo de limpieza de python-lxml. El analizador del m\u00f3dulo no imitaba apropiadamente los navegadores, lo que causaba comportamientos diferentes entre el sanitizador y la p\u00e1gina del usuario. Un atacante remoto podr\u00eda explotar este fallo para ejecutar c\u00f3digo HTML/JS arbitrario"
    }
  ],
  "id": "CVE-2020-27783",
  "lastModified": "2026-06-17T03:09:38.167",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
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        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
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      {
        "cvssData": {
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          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-27783",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-12-17T21:02:01.991144Z",
          "version": "2.0.3"
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  "published": "2020-12-03T17:15:13.177",
  "references": [
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  "vulnStatus": "Modified",
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}



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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.



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.