CVE-2021-31547

MEDIUM 4.3CVE-2021-31547 · Published 22/04/2021 · updated 17/06/2026

In short

CVE-2021-31547 is a MEDIUM (CVSS 4.3) vulnerability affecting mediawiki (mediawiki).
Chance of exploitation in the next 30 days (EPSS): 0.87%, higher than 58.9% 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. Its AbuseFilterCheckMatch API reveals suppressed edits and usernames to unprivileged users through the iteration of crafted AbuseFilter rules.

References

gerrit.wikimedia.org/r/q/I3f7dbd8b873d411e37c8c3aac2339bf5ec36907d · Issue Tracking
gerrit.wikimedia.org/r/q/I4900b1be73323599d74e3164447f81eded094d75 · Issue Tracking
phabricator.wikimedia.org/T223654 · Third Party Advisory

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Package

Affected versions

Patched versions

mediawiki

≤ 1.35.2

No fix yet

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