{"id":"CVE-2021-41798","aliases":["BIT-mediawiki-2021-41798","DEBIAN-CVE-2021-41798","DLA-2779-1","DSA-4979-1","EUVD-2021-28806","GHSA-6w7p-46mm-c2fc","MGASA-2021-0477","UBUNTU-CVE-2021-41798"],"status":"published","title":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being...","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01443,"percentile":0.73461,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2021-10-01T00:00:00Z","modified":"2026-10-24T10:30:55Z","fixes":[{"ecosystem":"Bitnami","package":"mediawiki","fixed_in":["1.36.2"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"mediawiki","fixed_in":["1:1.35.4-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"mediawiki","fixed_in":["1:1.35.4-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"mediawiki","fixed_in":["1:1.35.4-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mediawiki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.36.2"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.35.4-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.35.4-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.35.4-1"}]}]},{"source":"osv","ecosystem":"Debian:9","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.27.7-1~deb9u10"}]}],"versions":["1:1.27.3-1","1:1.27.4-1","1:1.27.4-1~bpo8+1","1:1.27.4-1~deb9u1","1:1.27.4-2","1:1.27.4-3","1:1.27.5-1~deb9u1","1:1.27.6-1~deb9u1","1:1.27.7-1~deb9u1","1:1.27.7-1~deb9u2","1:1.27.7-1~deb9u3","1:1.27.7-1~deb9u4","1:1.27.7-1~deb9u5","1:1.27.7-1~deb9u6","1:1.27.7-1~deb9u7","1:1.27.7-1~deb9u8","1:1.27.7-1~deb9u9"],"bundled":3},{"source":"osv","ecosystem":"Debian:10","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.31.16-1~deb10u1"}]}],"versions":["1:1.31.10-1~deb10u1","1:1.31.12-1~deb10u1","1:1.31.14-1~deb10u1","1:1.31.2-1","1:1.31.4-1","1:1.31.4-1~deb10u1","1:1.31.5-1","1:1.31.5-2","1:1.31.5-3","1:1.31.6-1","1:1.31.6-1~deb10u1","1:1.31.7-1","1:1.31.7-1~deb10u1","1:1.31.8-1"],"bundled":5},{"source":"osv","ecosystem":"Debian:11","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.35.4-1~deb11u1"}]}],"versions":["1:1.35.2-1","1:1.35.3-1"],"bundled":5},{"source":"osv","ecosystem":"Mageia:8","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.35.4-1.mga8"}]}],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.27.3-1","1:1.27.4-1","1:1.27.4-2","1:1.27.4-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.31.2-1ubuntu1","1:1.31.5-1","1:1.31.5-1ubuntu1","1:1.31.5-2","1:1.31.5-3","1:1.31.5-3ubuntu1","1:1.31.6-1","1:1.31.7-1","1:1.31.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.35.3-1","1:1.35.4-1","1:1.35.5-1","1:1.35.5-1ubuntu1","1:1.35.5-1ubuntu2","1:1.35.5-1ubuntu3","1:1.35.6-1","1:1.35.6-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.39.4-2","1:1.39.5-1","1:1.39.6-1","1:1.39.7-1","1:1.39.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.1+dfsg-1","1:1.43.1+dfsg-2","1:1.43.3+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.8+dfsg-2","1:1.43.9+dfsg-1","1:1.43.9+dfsg-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.3+dfsg-1","1:1.43.5+dfsg-1","1:1.43.6+dfsg-2","1:1.43.8+dfsg-1","1:1.43.8+dfsg-2"]}],"products":[{"vendor":"fedoraproject","product":"fedora"},{"vendor":"mediawiki","product":"mediawiki"}],"references":[{"url":"https://phabricator.wikimedia.org/T285515","tags":["x_transferred","Exploit","Patch","Third Party Advisory","web","fix","report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://security.gentoo.org/glsa/202305-24","tags":["vendor-advisory","x_transferred","web","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41798","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/"},{"url":"https://github.com/advisories/GHSA-6w7p-46mm-c2fc"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-41798","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0477.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29531","tags":["report"]},{"url":"https://www.debian.org/security/2021/dsa-4979","tags":["web"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-41798","tags":["report"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-41798","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-41798","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","status":"published","published":"2021-10-11T00:00:00Z","modified":"2024-08-04T03:22:24.292Z","updated_at":"2026-11-02T14:32:59.430294Z"}],"euvd":[{"id":"EUVD-2021-28806","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","status":"published","published":"2021-10-11T00:00:00Z","modified":"2024-08-04T03:22:24Z","updated_at":"2026-11-03T03:24:17.230256Z"}],"ghsa":[{"id":"GHSA-6w7p-46mm-c2fc","title":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being...","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","status":"published","published":"2022-05-24T19:17:14Z","modified":"2023-05-22T00:30:17Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:54:35.559556Z"}],"nvd":[{"id":"CVE-2021-41798","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","status":"published","published":"2021-10-11T08:15:06.647Z","modified":"2026-06-17T04:08:55.93Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:59.689345Z"}],"osv":[{"id":"CVE-2021-41798","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","status":"published","published":"2021-10-11T08:15:06.647Z","modified":"2026-10-24T10:30:55.947828479Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:21.557945Z"},{"id":"DEBIAN-CVE-2021-41798","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","status":"published","published":"2021-10-11T08:15:06.647Z","modified":"2026-10-23T18:03:50.806030634Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"UBUNTU-CVE-2021-41798","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","status":"published","published":"2021-10-11T08:15:00Z","modified":"2026-10-17T12:56:01.338974258Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:29.220315Z"},{"id":"BIT-mediawiki-2021-41798","description":"MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.","status":"published","published":"2024-03-06T11:11:07.964Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"},{"id":"DLA-2779-1","title":"mediawiki - security update","status":"published","published":"2021-10-09T00:00:00Z","modified":"2026-03-09T01:19:08.000356Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"DSA-4979-1","title":"mediawiki - security update","status":"published","published":"2021-10-01T00:00:00Z","modified":"2026-03-09T02:10:09.371177Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2021-0477","title":"Updated mediawiki packages fix security vulnerability","description":"XSS vulnerability in Special:Search. (CVE-2021-41798)\nApiQueryBacklinks can cause a full table scan. (CVE-2021-41799)\nFix PoolCounter protection of Special:Contributions. (CVE-2021-41800)\nReplaceText continues performing actions if the user no longer has the\ncorrect permission (such as by being blocked). (CVE-2021-41801)\n","status":"published","published":"2021-10-13T19:39:52Z","modified":"2026-04-16T04:40:38.346680857Z","updated_at":"2026-11-02T15:49:41.849028Z"}]}}