CVE-2006-6421: Phpbb Group Phpbb

Medium severity, CVSS 6.0. EPSS: 15.6% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in the private message box implementation (privmsg.php) in phpBB 2.0.x allows remote authenticated users to inject arbitrary web script or HTML via the "Message body" field in a message to a non-existent user.

Affected products

• Phpbb Group Phpbb: version 2.0 only; version 2.0.0 only; version 2.0.1 only; version 2.0.2 only; version 2.0.3 only; version 2.0.4 only; …

Published 2006-12-10. Last modified 2026-06-16.