CVE-2016-4309: Getsymphony Symphony

High severity, CVSS 7.5. EPSS: 10.2% chance of exploitation in the next 30 days.

Session fixation vulnerability in Symphony CMS 2.6.7, when session.use_only_cookies is disabled, allows remote attackers to hijack web sessions via the PHPSESSID parameter.

Affected products

• Getsymphony Symphony: version 2.6.7 only

Published 2016-06-30. Last modified 2026-06-17.