Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
Cas2Handler builds this service parameter from Request::getSchemeAndHttpHost(), which reflects the attacker-controlled HTTP Host header whenever Symfony's framework.trusted_hosts setting is not configured (the default). An attacker who controls any other application registered with the same CAS server can replay a victim's ticket against the Symfony application, with a spoofed Host header, and be authenticated as that victim.
Resolution
A new required service_url configuration option is introduced on Cas2Handler. The CAS service parameter sent to the validation endpoint is now built from this configured URL instead of being derived from the request's Host header, preventing cross-service ticket replay via Host header spoofing.
The patch for this issue is available here for branch 7.4.
Credits
Symfony would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and Nicolas Grekas for providing the fix.
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | symfony/security-http | >= 7.1.0, < 7.4.12, >= 8.0.0, < 8.0.12 | 7.4.12, 8.0.12 |
| Paquete de Composer | symfony/symfony | >= 7.1.0, < 7.4.12, >= 8.0.0, < 8.0.12 | 7.4.12, 8.0.12 |
Referencias
- https://github.com/symfony/symfony/security/advisories/GHSA-j8gj-9rm5-4xhx
- https://github.com/symfony/symfony/commit/5ba145dba702404801bdf9e7e8d6df170060d541
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2026-45074.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45074.yaml
- https://github.com/symfony/symfony
- https://symfony.com/cve-2026-45074
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U- Debilidad (CWE)
CWE-290- Plataforma
- Composer
- Paquete
symfony/security-http, symfony/symfony- Publicada
- 27.05.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-j8gj-9rm5-4xhx - CC BY 4.0
Historial de vulnerabilidades: symfony/security-http
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 20
- Primera → última
- 12.2019 06.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 10
- Media 8
- Baja 2
Divulgaciones por año
- 2019: 1
- 2020: 2
- 2021: 3
- 2022: 7
- 2023: 1
- 2024: 1
- 2025: 0
- 2026: 5
-
Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.