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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (41.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
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
- github.com/symfony/symfony/security/advisories/GHSA-j8gj-9rm5-4xhx (Patch, Vendor Advisory)
- github.com/symfony/symfony/commit/5ba145dba702404801bdf9e7e8d6df170060d541 (Patch)
- github.com/symfony/symfony/releases/tag/v7.4.12 (Product, Release Notes)
- github.com/symfony/symfony/releases/tag/v8.0.12 (Product, 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.