CVE-2023-37252

Published Sep 14, 2026 CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Description
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
Title Hidden Usernames Leak in MediaWiki CheckUser Extension
Type Values Removed Values Added
Title Hidden Usernames Leak in MediaWiki CheckUser Extension
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mediawiki
Mediawiki checkuser
Weaknesses CWE-669
CPEs cpe:2.3:a:mediawiki:checkuser:*:*:*:*:*:*:*:*
Vendors & Products Mediawiki
Mediawiki checkuser
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'}

Type Values Removed Values Added
Description An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 14, 2026, 4:16 PM
Reserved
Jun 29, 2023, 12:00 AM
Status
Awaiting Analysis
Published
Sep 14, 2026, 5:16 AM
Modified
Sep 16, 2026, 7:31 PM