CVE-2018-11406: Debian Linux

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue was discovered in the Security component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. By default, a user's session is invalidated when the user is logged out. This behavior can be disabled through the invalidate_session option. In this case, CSRF tokens were not erased during logout which allowed for CSRF token fixation.

Affected products

• Debian Debian Linux: version 9.0 only
• Sensiolabs Symfony: from 2.7.0, before 2.7.48 (fixed in 2.7.48); from 2.8.0, before 2.8.41 (fixed in 2.8.41); from 3.3.0, before 3.3.17 (fixed in 3.3.17); from 3.4.0, before 3.4.11 (fixed in 3.4.11); from 4.0.0, before 4.0.11 (fixed in 4.0.11)

Published 2018-06-13. Last modified 2026-06-17.