CVE-2009-3421: Zenas Pao-Bacheca Guestbook

Critical severity, CVSS 9.8. EPSS: 5% chance of exploitation in the next 30 days.

login.php in Zenas PaoBacheca Guestbook 2.1, when register_globals is enabled, allows remote attackers to bypass authentication and gain administrative access by setting the login_ok parameter to 1.

Affected products

• Zenas Pao-Bacheca Guestbook: version 2.1 only

Published 2009-09-25. Last modified 2026-06-16.