CVE-2021-31549

MEDIUM 4.3CVE-2021-31549 · Published 22/04/2021 · updated 17/06/2026

In short

CVE-2021-31549 is a MEDIUM (CVSS 4.3) vulnerability affecting mediawiki (mediawiki).
Chance of exploitation in the next 30 days (EPSS): 0.80%, higher than 56.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
mediawiki mediawiki	`≤ 1.35.2`	No fix yet

Description

An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. The Special:AbuseFilter/examine form allowed for the disclosure of suppressed MediaWiki usernames to unprivileged users.

References

gerrit.wikimedia.org/r/q/I6063c02fa261c4cc0e6dbbb2db4e111eb85912c2 · Issue Tracking
gerrit.wikimedia.org/r/q/I71a6d521bd12931ce60eec4d2dc35af19146000f · Issue Tracking
phabricator.wikimedia.org/T274152 · Third Party Advisory

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Package

Affected versions

Patched versions

mediawiki

≤ 1.35.2

No fix yet

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