Vulnerability in Sensiolabs Symfony
CVE-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 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.
EPSS: 0.005 (39.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
Affected products
- Sensiolabs Symfony
- Symfony Security-http — versions >= 7.1.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
- Symfony — versions >= 7.1.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-45074?
- CVE-2026-45074 is a high-severity vulnerability in Sensiolabs Symfony, classified under Authentication Bypass by Spoofing. CVSS score: 8.1/10. Published 2026-07-14.
- How severe is CVE-2026-45074?
- High severity. CVSS v3 base score is 8.1 out of 10.