CVE-2026-45063
Severity CVSS v4.0:
CRITICAL
Type:
Unavailable / Other
Publication date:
14/07/2026
Last modified:
14/07/2026
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.
Impact
Base Score 4.0
9.10
Severity 4.0
CRITICAL
References to Advisories, Solutions, and Tools
- https://github.com/symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5a0d
- https://github.com/symfony/symfony/releases/tag/v5.4.52
- https://github.com/symfony/symfony/releases/tag/v6.4.40
- https://github.com/symfony/symfony/releases/tag/v7.4.12
- https://github.com/symfony/symfony/releases/tag/v8.0.12
- https://github.com/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2