What’s Vulnerable › Vulnerabilities

CVE-2021-31545

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-22 · updated 2026-06-17
• Weakness: CWE-200

Description

An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. The page_recent_contributors leaked the existence of certain deleted MediaWiki usernames, related to rev_deleted.

Affected products

• Wikimedia Foundation MediaWiki: through 1.35.2

References

• https://gerrit.wikimedia.org/r/q/I8d5ed9ca84282ee50832035af86123633fc88293
• https://phabricator.wikimedia.org/T71367
• https://gerrit.wikimedia.org/r/q/I8d5ed9ca84282ee50832035af86123633fc88293
• https://phabricator.wikimedia.org/T71367

Get alerted when CVE-2021-31545 or the next vulnerability affects your stack