CVE-2019-18886: Sensiolabs Symfony

Medium severity, CVSS 5.3. EPSS: 1.6% chance of exploitation in the next 30 days.

An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security.

Affected products

• Sensiolabs Symfony: from 4.2.0, up to and including 4.2.11; from 4.3.0, up to and including 4.3.7

Published 2019-11-21. Last modified 2026-06-17.