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OpenAdvisories

Product · Wikimedia Foundation

CheckUser

9 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

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  • Medium 4.8
    CVE-2026-34090

    Suggested investigations: Handle suppressed usernames

    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.

    Wikimedia Foundation CheckUser