high8.1
CVE-2026-45074
Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
Impact
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 7.1.0 until 7.4.12 and 8.0.12, Cas2Handler builds the CAS service parameter from Request::getSchemeAndHttpHost(), which reflects an attacker-controlled Host header when framework.trusted_hosts is not configured; an attacker controlling another application registered with the same CAS server can replay a victim ticket against the Symfony application and authenticate as the victim. This issue is fixed in versions 7.4.12 and 8.0.12.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | symfony/security-http | >= 7.1.0, < 7.4.12 | 7.4.12 |
| composer | symfony/symfony | >= 7.1.0, < 7.4.12 | 7.4.12 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Sensiolabs | Symfony | from 7.1.0 before 7.4.12 from 8.0.0 before 8.0.12 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-j8gj-9rm5-4xhx
- 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://symfony.com/cve-2026-45074
- https://github.com/symfony/symfony/releases/tag/v7.4.12
- https://github.com/symfony/symfony/releases/tag/v8.0.12