Symfony: Security Firewall Bypass via failure_forward Subrequest: Unauthenticated Access to access_control-Protected GET Routes

Summary

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, DefaultAuthenticationFailureHandler honored the request-supplied _failure_path parameter when failure_forward: true was enabled, allowing an unauthenticated failing login request to dispatch a subrequest to access_control-protected GET routes that skipped firewall listeners. This issue is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13.

Timeline

1. Jul 14, 2026, 7:14 PM UTCCVE published
2. Jul 16, 2026, 2:39 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Jul 16, 2026, 2:40 PM UTCRecord last updated

Affected versions

• symfony symfony

  fixed in 5.4.53; From 6.0.0-BETA1 · fixed in 6.4.41; From 7.0.0-BETA1 · fixed in 7.4.13; From 8.0.0-BETA1 · fixed in 8.0.13

• symfony security-http

  fixed in 5.4.53; From 6.0.0-BETA1 · fixed in 6.4.41; From 7.0.0-BETA1 · fixed in 7.4.13; From 8.0.0-BETA1 · fixed in 8.0.13

• symfony/security-httpPackagist

  fixed in 5.4.53

• symfony/symfonyPackagist

  fixed in 5.4.53

• symfony/security-httpPackagist

  From 6.0.0 · fixed in 6.4.41

• symfony/security-httpPackagist

  From 7.0.0 · fixed in 7.4.13

• symfony/security-httpPackagist

  From 8.0.0 · fixed in 8.0.13

• symfony/symfonyPackagist

  From 6.0.0 · fixed in 6.4.41

• symfony/symfonyPackagist

  From 7.0.0 · fixed in 7.4.13

• symfony/symfonyPackagist

  From 8.0.0 · fixed in 8.0.13

References 5