CVE-2015-8623

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    CVE-2015-8623

    Published: 23 Mar 2017Last Modified: 16 Apr 2026

    Summary:

    Details: The User::matchEditToken function in includes/User.php in MediaWiki before 1.23.12 and 1.24.x before 1.24.5 does not perform token comparison in constant time before returning, which allows remote attackers to guess the edit token and bypass CSRF protection via a timing attack, a different vulnerability than CVE-2015-8624.

    References: http://www.openwall.com/lists/oss-security/2015/12/21/8, http://www.openwall.com/lists/oss-security/2015/12/23/7, https://gerrit.wikimedia.org/r/#/c/156336/5/includes/User.php, https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-December/000186.html, https://phabricator.wikimedia.org/T119309, http://www.openwall.com/lists/oss-security/2015/12/21/8, http://www.openwall.com/lists/oss-security/2015/12/23/7, http://www.openwall.com/lists/oss-security/2015/12/21/8, http://www.openwall.com/lists/oss-security/2015/12/23/7, https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-December/000186.html, https://phabricator.wikimedia.org/T119309, https://gerrit.wikimedia.org/r/#/c/156336/5/includes/User.php

    Affected packages

    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