{"schema_version":"1.7.3","id":"GHSA-pgww-xf46-h92r","published":"2021-01-07T21:54:01Z","modified":"2025-12-20T05:25:57.674445Z","aliases":["CVE-2020-27783","PYSEC-2020-62"],"summary":"lxml vulnerable to Cross-site Scripting","details":"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.","affected":[{"package":{"name":"lxml","ecosystem":"PyPI","purl":"pkg:pypi/lxml"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.6.2"}]}],"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"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/01/GHSA-pgww-xf46-h92r/GHSA-pgww-xf46-h92r.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27783"},{"type":"WEB","url":"https://github.com/lxml/lxml/commit/a105ab8dc262ec6735977c25c13f0bdfcdec72a7"},{"type":"WEB","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"WEB","url":"https://www.debian.org/security/2020/dsa-4810"},{"type":"WEB","url":"https://snyk.io/vuln/SNYK-PYTHON-LXML-1047473"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20210521-0003"},{"type":"WEB","url":"https://pypi.org/project/lxml"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2020/12/msg00028.html"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2020-62.yaml"},{"type":"WEB","url":"https://github.com/lxml/lxml"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-pgww-xf46-h92r"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1901633"},{"type":"WEB","url":"https://advisory.checkmarx.net/advisory/CX-2020-4286"}],"database_specific":{"cwe_ids":["CWE-79"],"github_reviewed":true,"github_reviewed_at":"2021-01-07T21:53:43Z","nvd_published_at":"2020-12-03T17:15:00Z","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"}]}