Known Vulnerabilities for Checkuser by Mediawiki

Listed below are 8 of the newest known vulnerabilities associated with "Checkuser" by "Mediawiki".

These CVEs are retrieved based on exact matches on listed software, hardware, and vendor information (CPE data) as well as a keyword search to ensure the newest vulnerabilities with no officially listed software information are still displayed.

Data on known vulnerable versions is also displayed based on information from known CPEs

Known Vulnerabilities

CVE Shortened Description Severity Publish Date Last Modified
CVE-2026-34090 json Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. This issue affec... Not Provided 2026-05-11 2026-05-11
CVE-2025-67478 json Not Provided 2026-02-03 2026-04-14
CVE-2025-61658 json Not Provided 2026-02-03 2026-04-14
CVE-2025-61651 json Not Provided 2026-02-03 2026-04-09
CVE-2025-61648 json Not Provided 2026-02-03 2026-04-09
CVE-2019-18611 json An issue was discovered in the CheckUser extension through 1.34 for MediaWiki. Certain sensitive information within oversight... 6.5 - MEDIUM 2019-10-29 2019-10-31
CVE-2019-16529 json An issue was discovered in the CheckUser extension through 1.35.0 for MediaWiki. Oversighted edit summaries are still visible... 5.3 - MEDIUM 2020-03-19 2020-03-24
CVE-2015-2940 json Not Provided 2015-04-13 2026-05-06

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationMediawikiCheckuser2.3
ApplicationMediawikiCheckuser1.35
ApplicationMediawikiCheckuser1.34
ApplicationMediawikiCheckuser1.33
ApplicationMediawikiCheckuser1.32
ApplicationMediawikiCheckuser1.31
ApplicationMediawikiCheckuser1.30
ApplicationMediawikiCheckuser1.29
ApplicationMediawikiCheckuser1.28
ApplicationMediawikiCheckuser1.27
ApplicationMediawikiCheckuser1.26
ApplicationMediawikiCheckuser1.25
ApplicationMediawikiCheckuser1.24
ApplicationMediawikiCheckuser1.23
ApplicationMediawikiCheckuser1.22
ApplicationMediawikiCheckuser1.21
ApplicationMediawikiCheckuser1.20
ApplicationMediawikiCheckuser1.19
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