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High severity · published Jul 14, 2026
CVE-2026-45074
Symfony: Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay
8.1
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-http · symfony
>= 7.1.0-BETA1, < 7.4.12; >= 8.0.0-BETA1, < 8.0.12 · source: vendor
SY
symfony · symfony
>= 7.1.0-BETA1, < 7.4.12; >= 8.0.0-BETA1, < 8.0.12 · source: vendor, NVD
Affected product
SE
security-http
symfony
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45074
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45074
Patch
https://github.com/symfony/symfony/commit/5ba145dba702404801bdf9e7e8d6df170060d541
Product
https://github.com/symfony/symfony/releases/tag/v7.4.12
Product
https://github.com/symfony/symfony/releases/tag/v8.0.12
Patch
https://github.com/symfony/symfony/security/advisories/GHSA-j8gj-9rm5-4xhx
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