CVE-2008-5840: Phpicalendar

High severity, CVSS 7.5. EPSS: 3% chance of exploitation in the next 30 days.

PHP iCalendar 2.24 and earlier allows remote attackers to bypass authentication by setting the phpicalendar and phpicalendar_login cookies to 1.

Affected products

• Phpicalendar Phpicalendar: up to and including 2.24; version 0.7 only; version 0.8 only; version 0.9 only; version 0.9.5 only; version 1.0 only; …
• Phpicalendar PHPICALENDAR2.0: version alpha_test only

Published 2009-01-05. Last modified 2026-06-16.