{
"id": "GHSA-jq4v-f5q6-mjqq",
"aliases": [
"CVE-2021-28957"
],
"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.",
"summary": "lxml vulnerable to Cross-Site Scripting ",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.6.3"
}
]
}
],
"package": {
"name": "lxml",
"ecosystem": "PyPI"
}
}
],
"modified": "2024-09-30T16:54:23Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
},
{
"type": "CVSS_V4",
"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"
}
],
"published": "2021-03-22T16:53:53Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957",
"type": "ADVISORY"
},
{
"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/[email protected] /message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/[email protected] /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": "WEB"
},
{
"url": "https://github.com/lxml/lxml",
"type": "PACKAGE"
},
{
"url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq",
"type": "ADVISORY"
},
{
"url": "https://bugs.launchpad.net/lxml/+bug/1888153",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2021-03-21T05:15:00Z",
"github_reviewed_at": "2021-03-22T16:52:59Z"
}
}