What’s Vulnerable › Vulnerabilities

CVE-2021-31547

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% 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. Its AbuseFilterCheckMatch API reveals suppressed edits and usernames to unprivileged users through the iteration of crafted AbuseFilter rules.

Affected products

• Wikimedia Foundation MediaWiki: through 1.35.2

References

• https://gerrit.wikimedia.org/r/q/I3f7dbd8b873d411e37c8c3aac2339bf5ec36907d
• https://gerrit.wikimedia.org/r/q/I4900b1be73323599d74e3164447f81eded094d75
• https://phabricator.wikimedia.org/T223654
• https://gerrit.wikimedia.org/r/q/I3f7dbd8b873d411e37c8c3aac2339bf5ec36907d
• https://gerrit.wikimedia.org/r/q/I4900b1be73323599d74e3164447f81eded094d75
• https://phabricator.wikimedia.org/T223654

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