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    CVE-2011-1766

    includes/User.php in MediaWiki before 1.16.5, when wgBlockDisablesLogin is enabled, does not clear certain cached data after verification of an auth token fails, which allows remote attackers to bypass authentication by creating crafted wikiUserID and wikiUserName cookies, or by leveraging an unattended workstation.

    Published:May 23, 2011
    Last Modified:Apr 11, 2025
    EPS:May 23, 2011
    EPSS Score:0.00432
    CVSS Score:5.8

    Affected Products

    Vendor
    Mediawiki
    Product
    Mediawiki

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-34095 (CVSS 0) — Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files include…
    CVE-2026-34094 (CVSS 2) — Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files include…
    CVE-2026-34093 (CVSS 1.1) — Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. …
    CVE-2026-34092 (CVSS 2.1) — Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. …
    CVE-2026-34091 (CVSS 5.5) — Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. T…
    CVE-2026-34088 (CVSS 1.3) — Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. T…
    CVE-2026-34087 (CVSS 5.1) — Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation OATHAuth. Th…
    CVE-2025-67481 (CVSS 0) — Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in W…
    CVE-2025-67483 (CVSS 0) — Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in W…
    CVE-2025-67484 (CVSS 0) — Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/…

    References

    http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060435.html
    http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060496.html
    http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060507.html
    http://lists.wikimedia.org/pipermail/mediawiki-announce/2011-May/000098.html
    http://secunia.com/advisories/44684
    http://www.securityfocus.com/bid/47722
    https://bugzilla.redhat.com/show_bug.cgi?id=702512
    https://bugzilla.wikimedia.org/show_bug.cgi?id=28639
    http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060435.html
    http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060496.html
    http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060507.html
    http://lists.wikimedia.org/pipermail/mediawiki-announce/2011-May/000098.html
    http://secunia.com/advisories/44684
    http://www.securityfocus.com/bid/47722
    https://bugzilla.redhat.com/show_bug.cgi?id=702512
    https://bugzilla.wikimedia.org/show_bug.cgi?id=28639

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High