Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M
CVE-2026-45074Symfony: Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
High 7.6
In plain English
A high-severity authentication bypass by spoofing in security-http from symfony. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | symfony | 7.4.12+dfsg-1 | DEBIAN-CVE-2026-45074 |
| Packagist | symfony/security-http | 8.0.12 | GHSA-j8gj-9rm5-4xhx |
| Packagist | symfony/security-http | 7.4.12 | GHSA-j8gj-9rm5-4xhx |
| Packagist | symfony/symfony | 7.4.12 | GHSA-j8gj-9rm5-4xhx |
| Packagist | symfony/symfony | 8.0.12 | GHSA-j8gj-9rm5-4xhx |
| Ubuntu:25.10 | symfony | no fix listed | UBUNTU-CVE-2026-45074 |
| Ubuntu:26.04:LTS | symfony | no fix listed | UBUNTU-CVE-2026-45074 |
| Ubuntu:26.10 | symfony | no fix listed | UBUNTU-CVE-2026-45074 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| symfony | symfony | >= 7.1.0-BETA1, < 7.4.12>= 8.0.0-BETA1, < 8.0.12 |
| symfony | security-http | >= 7.1.0-BETA1, < 7.4.12>= 8.0.0-BETA1, < 8.0.12 |
Weakness: CWE-290 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/symfony/symfony/security/advisories/GHSA-j8gj-9rm5-4xhx x_refsource_CONFIRM
- https://github.com/symfony/symfony/commit/5ba145dba702404801bdf9e7e8d6df170060d541 x_refsource_MISC
- https://github.com/symfony/symfony/releases/tag/v7.4.12 x_refsource_MISC
- https://github.com/symfony/symfony/releases/tag/v8.0.12 x_refsource_MISC