CVE-2011-5251: vBulletin

Medium severity, CVSS 5.8. EPSS: 1.5% chance of exploitation in the next 30 days.

Open redirect vulnerability in forum/login.php in vBulletin 4.1.3 and earlier allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via the url parameter in a lostpw action.

Affected products

• vBulletin vBulletin: up to and including 4.1.3; version 4.0.0 only; version 4.0.1 only; version 4.0.2 only; version 4.0.3 only; version 4.0.4 only; …

Published 2012-12-31. Last modified 2026-06-16.