{"id":"CVE-2021-36126","details":"An issue was discovered in the AbuseFilter extension in MediaWiki through 1.36. If the MediaWiki:Abusefilter-blocker message is invalid within the content language, the filter user falls back to the English version, but that English version could also be invalid on a wiki. This would result in a fatal error, and potentially fail to block or restrict a potentially nefarious user.","aliases":["BIT-mediawiki-2021-36126"],"modified":"2026-04-12T00:39:28.393245Z","published":"2021-07-02T13:15:07.787Z","references":[{"type":"FIX","url":"https://gerrit.wikimedia.org/r/q/I9e9f44b7663e810de70fb9ac7f6760f83dd4895b"},{"type":"FIX","url":"https://phabricator.wikimedia.org/T284364"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/wikimedia/mediawiki","events":[{"introduced":"0"},{"last_affected":"3da22025cf4ec7c143049685d4510870a5afd137"}],"database_specific":{"source":"CPE_FIELD","cpe":"cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"1.36"}]}}],"versions":["1.1.0","1.3.0beta1","1.36.0","1.36.0-rc.0","1.36.1","1.36.2","1.36.3","1.36.4","1.5.0alpha1","1.5.0alpha2","1.5.0beta1","1.5.0beta2","1.5.0beta3","1.5.0beta4","1.6.0","REL1_36"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-36126.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}