CVE-2002-1820: Ultimate PHP Board Project Ultimate PHP Board

Critical severity, CVSS 9.8. EPSS: 2.4% chance of exploitation in the next 30 days.

register.php in Ultimate PHP Board (UPB) 1.0 and 1.0b uses an administrative account Admin with a capital "A," but allows a remote attacker to impersonate the administrator by registering an account name of admin with a lower case "a."

Affected products

Published 2002-12-31. Last modified 2026-06-16.