High 7.6Published Jul 14, 2026

CVE-2026-45074Symfony: Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay

Updated under an hour ago (Oct 27, 2026, 7:10 AM ET)

Does this affect you?

It affects symfony and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for symfony

Exploited in the last 30 days

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.

CVSS: 7.6 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-290
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

symfony symfony symfony:symfony (from the name)	from 7.1.0-BETA1, < 7.4.12; from 8.0.0-BETA1, < 8.0.12	CNA record
symfony security-http symfony:security_http (from the name)	from 7.1.0-BETA1, < 7.4.12; from 8.0.0-BETA1, < 8.0.12	CNA record
sensiolabs symfony sensiolabs:symfony	from 7.1.0 before 7.4.12; from 8.0.0 before 8.0.12	NVD

References

References

https://github.com/symfony/symfony/security/advisories/GHSA-j8gj-9rm5-4xhx	x-refsource-confirm, patch, vendor-advisory
https://github.com/symfony/symfony/commit/5ba145dba702404801bdf9e7e8d6df170060d541	x-refsource-misc, patch
https://github.com/symfony/symfony/releases/tag/v7.4.12	x-refsource-misc, product, release-notes
https://github.com/symfony/symfony/releases/tag/v8.0.12	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.