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Wikimedia Foundation CheckUser vulnerabilities

12 known vulnerabilities, 0 confirmed exploited in the wild (CISA KEV), 9 published in the last 12 months.

Check whether your Wikimedia Foundation CheckUser version is affected

Latest Wikimedia Foundation CheckUser vulnerabilities

• CVE-2023-37252 — (CVSS 3.1)
• CVE-2026-34090 — Suggested investigations: Handle suppressed usernames (CVSS 7.5)
• CVE-2025-67478 — Wrong E-Mail address composition for usernames with a comma and Umlauts in it like "Döe, Jähn" (CVSS 8.8)
• CVE-2025-61658 — Special:GlobalContributions shows edits on wikis the viewer doesn't have access to (CVSS 4.3)
• CVE-2025-61651 — i18n XSS through Special:CheckUser CheckUser helper (CVSS 6.1)
• CVE-2025-61650 — UserInfoCard is vulnerable to message key stored XSS (CVSS 1.1)
• CVE-2025-61649 — UserInfoCard: Check that performing user has permission to view log entries for number of past blocks (CVSS 1.1)
• CVE-2025-61648 — Stored XSS through system messages in CheckUser (CVSS 6.1)
• CVE-2025-61647 — UserInfoCard: Don't allow access to information about users who are suppressed if you don't have suppressor rights (CVSS 0.4)
• CVE-2019-16529 — (CVSS 5.3)
• CVE-2019-18611 — (CVSS 6.5)
• CVE-2015-2940 — (CVSS 6.8)