CVE-2026-45074

Symfony: Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay

Published Jul 14, 2026 CVSS 4.0 · 7.6 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-j8gj-9rm5-4xhx Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
History
Type Values Removed Values Added
First Time appeared Symfony
Symfony security-http
Symfony symfony
Vendors & Products Symfony
Symfony security-http
Symfony symfony
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Symfony: Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
Weaknesses CWE-290
References
Metrics cvssV4_0

{'score': 7.6, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 14, 2026, 6:24 PM
Reserved
May 8, 2026, 6:45 PM
Status
Analyzed
Published
Jul 14, 2026, 6:17 PM
Modified
Jul 15, 2026, 3:35 PM