CVE-2026-45074
Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
描述
`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](https://github.com/symfony/symfony/commit/5ba145dba702404801bdf9e7e8d6df170060d541) 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.
受影響套件(3)
- Debian/symfonyfrom 0, < 7.4.12+dfsg-1
- Packagist/symfony/security-http>= 7.1.0, < 7.4.12
- Packagist/symfony/symfony>= 7.1.0, < 7.4.12
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
參考連結(7)
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-45074
- PATCHhttps://github.com/symfony/symfony
- WEBhttps://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2026-45074.yaml
- WEBhttps://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45074.yaml
- WEBhttps://github.com/symfony/symfony/commit/5ba145dba702404801bdf9e7e8d6df170060d541
- WEBhttps://github.com/symfony/symfony/security/advisories/GHSA-j8gj-9rm5-4xhx
- WEBhttps://symfony.com/cve-2026-45074