{"id":"CVE-2021-39887","aliases":["BIT-gitlab-2021-39887","EUVD-2021-26243","GHSA-8j2x-wq4x-63v8","UBUNTU-CVE-2021-39887"],"status":"published","title":"A stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown in GitLab CE/EE...","description":"A stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown in GitLab CE/EE version 8.4 and above allowed an attacker to execute arbitrary JavaScript code on the victim's behalf.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00864,"percentile":0.5911,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2021-10-05T11:12:11Z","modified":"2026-10-30T10:30:17Z","fixes":[{"ecosystem":"Bitnami","package":"gitlab","fixed_in":["14.1.7","14.2.5","14.3.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"gitlab","ranges":[{"type":"SEMVER","events":[{"introduced":"8.4.0"},{"fixed":"14.1.7"},{"introduced":"14.2.0"},{"fixed":"14.2.5"},{"introduced":"14.3.0"},{"fixed":"14.3.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"gitlab","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.4.3+dfsg-9","8.4.3+dfsg-12","8.5.8+dfsg-5"]}],"products":[{"vendor":"gitlab","product":"gitlab"}],"references":[{"url":"https://gitlab.com/gitlab-org/gitlab/-/issues/332903","tags":["x_refsource_MISC","x_transferred","Broken Link","web","report"]},{"url":"https://hackerone.com/reports/1218174","tags":["x_refsource_MISC","x_transferred","Permissions Required","Third Party Advisory","advisory","report"]},{"url":"https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39887.json","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39887","tags":["web"]},{"url":"https://github.com/advisories/GHSA-8j2x-wq4x-63v8"},{"url":"https://ubuntu.com/security/CVE-2021-39887","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-39887","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-39887","description":"A stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown in GitLab CE/EE version 8.4 and above allowed an attacker to execute arbitrary JavaScript code on the victim's 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version 8.4 and above allowed an attacker to execute arbitrary JavaScript code on the victim's behalf.","status":"published","published":"2024-03-06T11:18:25.22Z","modified":"2026-09-10T16:01:32.890700801Z","updated_at":"2026-11-02T15:28:29.999658Z"}]}}