CVE-2015-4050: ESI unauthorized access

Affected Versions 2.3.19 - 2.3.28, 2.4.9 - 2.4.10, 2.5.4 - 2.5.11, 2.6.0 - 2.6.7 versions of the Symfony HttpKernel component are affected by this security issue. This issue has been fixed in Symfony 2.3.29, 2.5.12, and 2.6.8. Note that no fixes are provided for Symfony 2.4 as it's not maintained...