CVE-2015-8623

Name: CVE-2015-8623
Creator: NVD / NIST
Published: 2017-03-23T20:59:00.483+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.73%

Last modified Jun 17, 2026

CVE-2015-8623 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.73% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

0.73%

49.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	<= 1.23.11
Mediawiki	Mediawiki	1.24.0
Mediawiki	Mediawiki	1.24.1
Mediawiki	Mediawiki	1.24.2
Mediawiki	Mediawiki	1.24.3
Mediawiki	Mediawiki	1.24.4

References

http://www.openwall.com/lists/oss-security/2015/12/21/8Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2015/12/23/7Mailing List, Patch, Third Party Advisory
https://gerrit.wikimedia.org/r/#/c/156336/5/includes/User.phpIssue Tracking, Third Party Advisory
https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-December/000186.htmlPatch, Release Notes, Vendor Advisory
https://phabricator.wikimedia.org/T119309Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2015/12/21/8Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2015/12/23/7Mailing List, Patch, Third Party Advisory
https://gerrit.wikimedia.org/r/#/c/156336/5/includes/User.phpIssue Tracking, Third Party Advisory
https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-December/000186.htmlPatch, Release Notes, Vendor Advisory
https://phabricator.wikimedia.org/T119309Patch, Third Party Advisory

Timeline

Published: Mar 23, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-8623?

How severe is CVE-2015-8623?

Severity scoring for CVE-2015-8623 is pending analysis. The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.

How do I fix CVE-2015-8623?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-8623?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST