CVE-2006-3204: Ultimate PHP Board

Medium severity, CVSS 5.0. EPSS: 1.8% chance of exploitation in the next 30 days.

Ultimate PHP Board (UPB) 1.9.6 and earlier uses a cryptographically weak block cipher with a large key collision space, which allows remote attackers to determine a suitable decryption key given the plaintext and ciphertext by obtaining the plaintext password, which is sent when logging in, and the ciphertext, which is set in the pass_env cookie.

Affected products

• Ultimate PHP Board Ultimate PHP Board: version 1.8 only; version 1.8.2 only; version 1.9 only; version 1.9.6 only

Published 2006-06-24. Last modified 2026-06-16.