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Wikimedia Foundation Checkuser vulnerabilities
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mediawiki checkuser
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special...
CVE-2023-37252
3.1 Low
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wikimedia foundation checkuser, mediawiki +1 more
Stored XSS through a system message when blocking a temporary account that's related to other temporary accounts
CVE-2026-58034
0.0 None
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mediawiki checkuser
Suggested investigations: Handle suppressed usernames
CVE-2026-34090
4.8 Medium
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mediawiki checkuser
Special:GlobalContributions shows edits on wikis the viewer doesn't have access to
CVE-2025-61658
1.3 Low
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mediawiki checkuser
i18n XSS through Special:CheckUser CheckUser helper
CVE-2025-61651
0.0 None
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mediawiki checkuser
Stored XSS through system messages in CheckUser
CVE-2025-61648
0.0 None
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wikimedia foundation checkuser
UserInfoCard: Check that performing user has permission to view log entries for number of past blocks
CVE-2025-61649
1.1 Low
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wikimedia foundation checkuser
UserInfoCard is vulnerable to message key stored XSS
CVE-2025-61650
1.1 Low
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wikimedia foundation checkuser
UserInfoCard: Don't allow access to information about users who are suppressed if you don't have suppressor rights
CVE-2025-61647
0.3 Low
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mediawiki checkuser
Wrong E-Mail address composition for usernames with a comma and Umlauts in it like "Döe, Jähn"
CVE-2025-67478
Fix available
0.0 None
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the wikimedia foundation mediawiki - checkuser extension
CheckUser: Reflected Cross-Site Scripting (XSS) in Special:CheckUser via unsanitized internationalized message
CVE-2025-53479
5.4 Medium
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the wikimedia foundation mediawiki - checkuser extension
CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate (Account information tab) via unsanitized i18n messages
CVE-2025-53480
5.4 Medium
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the wikimedia foundation mediawiki - checkuser extension
CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate via unsanitized i18n messages
CVE-2025-53478
5.4 Medium