Mediawiki Checkuser vulnerabilities

9 vulnerabilities

Known vulnerabilities in Mediawiki Checkuser, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

6.8CVE-2015-2940debianmediawiki+2
EPSS score
1.09%
Cross-site request forgery (CSRF) vulnerability in the CheckUser extension for MediaWiki allows remote attackers to hijack the authentication of certain users for requests that retrieve sensitive user information via unspecified vectors.6.1CVE-2025-61648mediawikicheckuser+1
EPSS score
0.17%
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/ShowIPButton.Vue, modules/ext.CheckUser.TempAccounts/SpecialBlock.Js. This issue affects CheckUser: from * before 1.44.1.6.1CVE-2025-61651mediawikicheckuser+1
EPSS score
0.22%
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files modules/ext.CheckUser/checkuser/checkUserHelper/buildUserElement.Js. This issue affects CheckUser: from * before 1.44.1.4.3CVE-2025-61658mediawikicheckuser+1
EPSS score
0.27%
Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files src/GlobalContributions/GlobalContributionsPager.Php. This issue affects CheckUser: from * before 1.43.4, 1.44.1.8.8CVE-2025-67478debianmediawiki+3
EPSS score
0.35%
Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files includes/Mail/UserMailer.Php. This issue affects CheckUser: from * before 1.39.14, 1.43.4, 1.44.1.5.3CVE-2019-16529mediawikicheckuser
EPSS score
0.87%
An issue was discovered in the CheckUser extension through 1.35.0 for MediaWiki. Oversighted edit summaries are still visible in CheckUser results in violation of MediaWiki's permissions model.6.5CVE-2019-18611mediawikicheckuser
EPSS score
0.93%
An issue was discovered in the CheckUser extension through 1.34 for MediaWiki. Certain sensitive information within oversighted edit summaries made available via the MediaWiki API was potentially visible to users with various levels of access to this extension. Said users should not have been able to view these oversighted edit summaries via the MediaWiki API.7.5CVE-2026-34090debianmediawiki+3
EPSS score
0.38%
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. This issue affects CheckUser: from 1.45.0 before 1.45.2.3.1CVE-2023-37252mediawikicheckuser
EPSS score
0.24%
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.