What’s Vulnerable › Vulnerabilities

CVE-2015-8623

• Severity: high (CVSS 8.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-03-23 · updated 2026-06-17
• Weakness: CWE-352

Description

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.

Affected products

• Wikimedia Foundation MediaWiki: through 1.23.11; 1.24.0, 1.24.1, 1.24.2, 1.24.3, 1.24.4

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
• 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

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