CVE-2026-45074
High · 7.5Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
CVSS
7.5
EPSS
0.5%
Published
May 27, 2026
CISA due date
—
The record
`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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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