CVE-2026-45074
published 2026-07-14CVE-2026-45074: 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…
PriorityP345high8.1CVSS 3.1
AVNACLPRNUIRSUCHIHAN
EPSS
0.41%
33.8th percentile
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
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| sensiolabs | symfony | >= 7.1.0 < 7.4.12 | 7.4.12 |
| sensiolabs | symfony | >= 8.0.0 < 8.0.12 | 8.0.12 |
| symfony | security-http | — | — |
| symfony | security-http | — | — |
| symfony | security-http | >= 7.1.0 < 7.4.12 | 7.4.12 |
| symfony | security-http | >= 8.0.0 < 8.0.12 | 8.0.12 |
| symfony | symfony | — | — |
| symfony | symfony | — | — |
| symfony | symfony | >= 7.1.0 < 7.4.12 | 7.4.12 |
| symfony | symfony | >= 8.0.0 < 8.0.12 | 8.0.12 |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
nvdv4.07.6HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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VulDB
Symfony Cas2Handler authentication replay
vuldb·2026-05-28
CVE-2026-45074 [LOW] Symfony Cas2Handler authentication replay
A vulnerability, which was classified as problematic, was found in Symfony. The affected element is an unknown function of the component Cas2Handler. The manipulation results in authentication bypass by capture-replay.
This vulnerability is known as CVE-2026-45074. It is possible to launch the attack remotely. No exploit is available.
You should upgrade the affected component.
GHSA
Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
ghsa·2026-05-27
CVE-2026-45074 [MEDIUM] CWE-290 Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
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,
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-07-14
Published