{"id":"CVE-2021-29272","aliases":["GHSA-3x58-xr87-2fcj","GO-2022-0762"],"url":"https://o3.security/vulnerability/CVE-2021-29272","summary":"Cross-site scripting in bluemonday","details":"bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, defeating a protection mechanism against the \"script\" string.","published":"2021-03-27T18:15:13.737Z","modified":"2026-07-08T20:58:29.267881Z","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":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/microcosm-cc/bluemonday","fixedVersion":"1.0.5"}],"fix":{"url":"https://github.com/microcosm-cc/bluemonday/commit/524f142fe46e945b7dcd291d7805c4b7dcf75bee","label":"microcosm-cc/bluemonday@524f142"},"references":[{"type":"ADVISORY","url":"https://github.com/microcosm-cc/bluemonday/releases/tag/v1.0.5"},{"type":"ADVISORY","url":"https://vuln.ryotak.me/advisories/4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29272"},{"type":"WEB","url":"https://github.com/microcosm-cc/bluemonday/issues/111"},{"type":"WEB","url":"https://github.com/microcosm-cc/bluemonday/commit/524f142fe46e945b7dcd291d7805c4b7dcf75bee"},{"type":"PACKAGE","url":"https://github.com/microcosm-cc/bluemonday"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2022-0762"},{"type":"WEB","url":"https://vuln.ryotak.me/advisories/4.txt"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T20:58:29.267881Z"}}