{"id":"CVE-2020-6816","aliases":["GHSA-m6xf-fq7q-8743","PYSEC-2020-28"],"url":"https://o3.security/vulnerability/CVE-2020-6816","summary":"Bleach vulnerable to mutation XSS via whitelisted math or svg and raw tag","details":"In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.","published":"2020-03-24T22:15:12.657Z","modified":"2026-07-22T09:44:35.574034342Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"PyPI","name":"bleach","fixedVersion":"3.1.2"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/"},{"type":"ADVISORY","url":"https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743"},{"type":"EVIDENCE","url":"https://advisory.checkmarx.net/advisory/CX-2020-4277"},{"type":"EVIDENCE","url":"https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-22T09:44:35.574034342Z"}}