{"action":"Upgrade lxml to 4.6.3-1 or later.","affected":[{"fixed":"4.6.3-1","introduced":"0"}],"component":"lxml","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["4.6.3-1"],"id":"tcs_01M5NFHZ2F5FECAG15W4XYS9Q3","modified_at":"2026-10-23T18:03:25.906760072Z","published_at":"2021-03-21T05:15:13.367Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-28957","https://security-tracker.debian.org/tracker/CVE-2021-28957"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-28957","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-28957"}],"summary":"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 attrib"}