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mediawiki checkuser
8 known vulnerabilities across versions
Vulnerabilities are listed by affected version. Select any CVE for the full briefing and its intelligence graph.
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CVE-2026-34090
>= 1.45.0 and < 1.45.2
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. This issue affects Ch
7.5
HIGH
CVE-2025-67478
>= 1.39.0 and < 1.39.14
Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files includes/Mail/UserMailer.Php.
8.8
HIGH
CVE-2025-61658
>= 1.43.0 and < 1.43.4
Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files src/GlobalContributions/Globa
4.3
MEDIUM
CVE-2025-61651
< 1.44.1
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation
6.1
MEDIUM
CVE-2025-61648
< 1.44.1
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation
6.1
MEDIUM
CVE-2019-16529
<= 1.35
An issue was discovered in the CheckUser extension through 1.35.0 for MediaWiki. Oversighted edit summaries are still visible in C
5.3
MEDIUM
CVE-2019-18611
<= 1.34
An issue was discovered in the CheckUser extension through 1.34 for MediaWiki. Certain sensitive information within oversighted ed
6.5
MEDIUM
CVE-2015-2940
all versions
Cross-site request forgery (CSRF) vulnerability in the CheckUser extension for MediaWiki allows remote attackers to hijack the aut
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