Vulnerability Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, X509Authenticator extracts the user identifier from $_SERVER['SSL_CLIENT_S_DN'] with an unanchored regex that matches emailAddress= anywhere in the distinguished name, allowing an attacker with a trusted certificate containing emailAddress=victim inside another RDN value such as CN to authenticate as the victim. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sensiolabs | Symfony | < 5.4.52 |
Related Weaknesses (CWE)
References
- https://github.com/symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5aPatch
- https://github.com/symfony/symfony/releases/tag/v5.4.52ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v6.4.40ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v7.4.12ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v8.0.12ProductRelease Notes
- https://github.com/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2PatchVendor Advisory
FAQ
What is CVE-2026-45063?
CVE-2026-45063 is a vulnerability with a CVSS score of 9.1 (CRITICAL). Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, X509Authenticator extracts the user identifier from $_SER...
How severe is CVE-2026-45063?
CVE-2026-45063 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-45063?
Check the references section above for vendor advisories and patch information. Affected products include: Sensiolabs Symfony.