{"id":"CVE-2021-28833","aliases":["GHSA-9p29-94hp-8rvc"],"url":"https://o3.security/vulnerability/CVE-2021-28833","summary":"qiita-markdown Cross-site Scripting vulnerability","details":"Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.","published":"2021-06-21T13:15:08.083Z","modified":"2026-07-09T05:13:59.070056Z","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":null,"affectedPackages":[{"ecosystem":"RubyGems","name":"qiita-markdown","fixedVersion":"0.34.0"}],"fix":{"url":"https://github.com/increments/qiita-markdown/commit/b5d4e60bf537ceb177e70bf91653d29575e1aa21","label":"increments/qiita-markdown@b5d4e60"},"references":[{"type":"ADVISORY","url":"https://github.com/increments/qiita-markdown/releases"},{"type":"ADVISORY","url":"https://vuln.ryotak.me/advisories/50"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-28833"},{"type":"WEB","url":"https://github.com/increments/qiita-markdown/commit/b5d4e60bf537ceb177e70bf91653d29575e1aa21"},{"type":"PACKAGE","url":"https://github.com/increments/qiita-markdown"},{"type":"WEB","url":"https://github.com/increments/qiita-markdown/compare/v0.33.0...v0.34.0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T05:13:59.070056Z"}}