Changelog (since v4.2.6...v4.2.7)

• bug [Routing] fix trailing slash redirection with non-greedy trailing vars #31107 [Routing] fix trailing slash redirection with non-greedy trailing vars (@nicolas-grekas)
• bug [FrameworkBundle] decorate the ValidatorBuilder's translator with LegacyTranslatorProxy #31108 [FrameworkBundle] decorate the ValidatorBuilder's translator with LegacyTranslatorProxy (@nicolas-grekas)
• bug [HttpKernel] Fix get session when the request stack is empty #31121 [HttpKernel] Fix get session when the request stack is empty (@yceruto)
• bug [HttpFoundation] Make MimeTypeExtensionGuesser case insensitive #31084 [HttpFoundation] Make MimeTypeExtensionGuesser case insensitive (@vermeirentony)
• bug Revert "bug #30423 [Security] Rework firewall's access denied rule (dimabory)" #31142 Revert "bug [Security] Rework firewall's access denied rule #30423 [Security] Rework firewall's access denied rule (dimabory)" (@chalasr)
• security #cve-2019-10910 [DI] Check service IDs are valid (@nicolas-grekas)
• security #cve-2019-10909 [FrameworkBundle][Form] Fix XSS issues in the form theme of the PHP templating engine (@stof)
• security #cve-2019-10912 [Cache][PHPUnit Bridge] Prevent destructors with side-effects from being unserialized (@nicolas-grekas)
• security #cve-2019-10911 [Security] Add a separator in the remember me cookie hash (@pborreli)
• security #cve-2019-10913 [HttpFoundation] reject invalid method override (@nicolas-grekas)