What’s Vulnerable › Vulnerabilities

CVE-2023-37252

• Severity: low (CVSS 3.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-16
• Weakness: CWE-669

Description

An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.

Affected products

• Wikimedia Foundation CheckUser: before 1.35.11; from 1.36.0 before 1.38.7; from 1.39.0 before 1.39.4 — fixed in 1.35.11, 1.38.7, 1.39.4

How to fix

Upgrade to a fixed version: Wikimedia Foundation CheckUser 1.35.11, 1.38.7, 1.39.4. Check the vendor advisory for mitigations.

References

• https://phabricator.wikimedia.org/T330968
• https://phabricator.wikimedia.org/T330968

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