CVE-2026-45074
Published:July 14, 2026
Updated:July 21, 2026
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
https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v8.0.0 <v8.0.12Fix Suggestion:
Update to version v8.0.12https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v2.0.0BETA1 <v5.4.52Fix Suggestion:
Update to version v5.4.52https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v6.4.0 <v6.4.40Fix Suggestion:
Update to version v6.4.40https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v7.4.0 <v7.4.12Fix Suggestion:
Update to version v7.4.12symfony/symfony (PHP):
Affected version(s) >=v8.0.0 <v8.0.12Fix Suggestion:
Update to version v8.0.12symfony/symfony (PHP):
Affected version(s) >=v7.1.0 <v7.4.12Fix Suggestion:
Update to version v7.4.12symfony/security-http (PHP):
Affected version(s) >=v7.1.0 <v7.4.12Fix Suggestion:
Update to version v7.4.12symfony/security-http (PHP):
Affected version(s) >=v8.0.0 <v8.0.12Fix Suggestion:
Update to version v8.0.12Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
UNREPORTED
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing
EPSS
Base Score:
0.40