{"cve":"CVE-2020-6816","nvd":{"published":"2020-03-24T22:15:12.657","modified":"2026-06-17T03:23:51.570","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://advisory.checkmarx.net/advisory/CX-2020-4277","https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/","https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach","https://advisory.checkmarx.net/advisory/CX-2020-4277"],"products":["fedoraproject:fedora","mozilla:bleach"],"source":"nvd","synced_at":"2026-10-19T21:03:08.679916934+00:00"},"epss":{"cve":"CVE-2020-6816","score":0.0134,"percentile":0.7131,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-m6xf-fq7q-8743","url":"https://osv.dev/vulnerability/GHSA-m6xf-fq7q-8743","summary":"Bleach vulnerable to mutation XSS via whitelisted math or svg and raw tag","modified":"2026-07-08T06:00:46.400344992Z","packages":[{"ecosystem":"PyPI","name":"bleach","purl":"pkg:pypi/bleach","ranges":["<3.1.2"],"fixed":["3.1.2"]}]},{"id":"PYSEC-2020-28","url":"https://osv.dev/vulnerability/PYSEC-2020-28","summary":"","modified":"2023-11-08T04:03:57.116894Z","packages":[{"ecosystem":"PyPI","name":"bleach","purl":"pkg:pypi/bleach","ranges":["<3.1.2"],"fixed":["3.1.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}