{"schema_version":"1.7.3","id":"GHSA-jq4v-f5q6-mjqq","published":"2021-03-22T16:53:53Z","modified":"2024-09-30T17:01:18.596416Z","aliases":["CVE-2021-28957","PYSEC-2021-19"],"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.","affected":[{"package":{"name":"lxml","ecosystem":"PyPI","purl":"pkg:pypi/lxml"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.6.3"}]}],"versions":["1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","2.0","2.0.10","2.0.11","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1","2.1.1","2.1.2","2.1.3","2.1.4","2.1.5","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","2.3","2.3.1","2.3.2","2.3.3","2.3.4","2.3.5","2.3.6","3.0","3.0.2","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","3.3.0","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","3.5.0","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","4.3.2","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"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-jq4v-f5q6-mjqq/GHSA-jq4v-f5q6-mjqq.json"}}],"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"}],"database_specific":{"cwe_ids":["CWE-79"],"github_reviewed":true,"github_reviewed_at":"2021-03-22T16:52:59Z","nvd_published_at":"2021-03-21T05:15:00Z","severity":"MODERATE"},"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"}]}