CVE-2015-4050: Sensiolabs Symfony

Medium severity, CVSS 4.3. EPSS: 8.2% chance of exploitation in the next 30 days.

FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through 2.6.7, when ESI or SSI support enabled, does not check if the _controller attribute is set, which allows remote attackers to bypass URL signing and security rules by including (1) no hash or (2) an invalid hash in a request to /_fragment.

Affected products

• Sensiolabs Symfony: version 2.3.19 only; version 2.3.20 only; version 2.3.21 only; version 2.3.22 only; version 2.3.23 only; version 2.3.24 only; …

Published 2015-06-02. Last modified 2026-06-17.