CVE-2009-3622: WordPress

Medium severity, CVSS 4.3. EPSS: 5.8% chance of exploitation in the next 30 days.

Algorithmic complexity vulnerability in wp-trackback.php in WordPress before 2.8.5 allows remote attackers to cause a denial of service (CPU consumption and server hang) via a long title parameter in conjunction with a charset parameter composed of many comma-separated "UTF-8" substrings, related to the mb_convert_encoding function in PHP.

Affected products

• WordPress WordPress: up to and including 2.8.4

Published 2009-10-23. Last modified 2026-06-16.