{"id":"CVE-2021-31550","aliases":["BIT-mediawiki-2021-31550","EUVD-2021-18447","GHSA-j4x7-chwp-xcr5"],"status":"published","title":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted...","description":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00467,"percentile":0.40898,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2021-04-22T02:30:00Z","modified":"2026-10-24T10:30:46Z","fixes":[{"ecosystem":"Bitnami","package":"mediawiki","fixed_in":["1.35.3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mediawiki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.35.3"}]}]}],"products":[{"vendor":"mediawiki","product":"mediawiki"}],"references":[{"url":"https://phabricator.wikimedia.org/T270767","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","web","advisory"]},{"url":"https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Commentbox/+/651934/","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Vendor Advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31550","tags":["web"]},{"url":"https://github.com/advisories/GHSA-j4x7-chwp-xcr5"}],"sources":{"cve":[{"id":"CVE-2021-31550","description":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.","status":"published","published":"2021-04-22T02:30:00Z","modified":"2024-08-03T23:03:33.411Z","updated_at":"2026-11-02T14:33:05.331617Z"}],"euvd":[{"id":"EUVD-2021-18447","description":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.","status":"published","published":"2021-04-22T02:30:00Z","modified":"2024-08-03T23:03:33Z","updated_at":"2026-11-03T03:24:38.977347Z"}],"ghsa":[{"id":"GHSA-j4x7-chwp-xcr5","title":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted...","description":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.","status":"published","published":"2022-05-24T17:48:07Z","modified":"2023-01-29T05:06:26Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:01.439998Z"}],"nvd":[{"id":"CVE-2021-31550","description":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.","status":"published","published":"2021-04-22T03:15:08.097Z","modified":"2026-06-17T03:51:59.423Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:52.03307Z"}],"osv":[{"id":"CVE-2021-31550","description":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.","status":"published","published":"2021-04-22T03:15:08.097Z","modified":"2026-10-24T10:30:46.738826159Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:19.483607Z"},{"id":"BIT-mediawiki-2021-31550","description":"An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.","status":"published","published":"2024-03-06T11:12:11.104Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"}]}}