CVE-2013-4338: WordPress

High severity, CVSS 7.5. EPSS: 8.7% chance of exploitation in the next 30 days.

wp-includes/functions.php in WordPress before 3.6.1 does not properly determine whether data has been serialized, which allows remote attackers to execute arbitrary code by triggering erroneous PHP unserialize operations.

Affected products

• WordPress WordPress: up to and including 3.6

Published 2013-09-12. Last modified 2026-06-16.