CVE-2018-11407: Sensiolabs Symfony

Critical severity, CVSS 9.8. EPSS: 2.3% chance of exploitation in the next 30 days.

An issue was discovered in the Ldap component in Symfony 2.8.x before 2.8.37, 3.3.x before 3.3.17, 3.4.x before 3.4.7, and 4.0.x before 4.0.7. It allows remote attackers to bypass authentication by logging in with a "null" password and valid username, which triggers an unauthenticated bind. NOTE: this issue exists because of an incomplete fix for CVE-2016-2403.

Affected products

• Sensiolabs Symfony: from 2.8.0, before 2.8.37 (fixed in 2.8.37); from 3.3.0, before 3.3.17 (fixed in 3.3.17); from 3.4.0, before 3.4.7 (fixed in 3.4.7); from 4.0.0, before 4.0.7 (fixed in 4.0.7)

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