CVE-2026-45063
Published:July 14, 2026
Updated:July 20, 2026
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.
Affected Packages
https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v6.4.0 <v6.4.38Fix Suggestion:
Update to version v6.4.38https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v2.0.0BETA1 <v5.4.52Fix Suggestion:
Update to version v5.4.52https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v8.0.0 <v8.0.9Fix Suggestion:
Update to version v8.0.9https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v7.4.0 <v7.4.9Fix Suggestion:
Update to version v7.4.9symfony/security-http (PHP):
Affected version(s) >=v7.0.0-BETA1 <v7.4.12Fix Suggestion:
Update to version v7.4.12symfony/symfony (PHP):
Affected version(s) >=dev-add-security-skills <v5.4.52Fix Suggestion:
Update to version v5.4.52symfony/symfony (PHP):
Affected version(s) >=v7.0.0-BETA1 <v7.4.12Fix Suggestion:
Update to version v7.4.12symfony/security-http (PHP):
Affected version(s) >=v6.0.0-BETA1 <v6.4.40Fix Suggestion:
Update to version v6.4.40symfony/security-http (PHP):
Affected version(s) >=v2.4.0-BETA1 <v5.4.52Fix Suggestion:
Update to version v5.4.52symfony/security-http (PHP):
Affected version(s) >=v8.0.0-BETA1 <v8.0.12Fix Suggestion:
Update to version v8.0.12symfony/symfony (PHP):
Affected version(s) >=v6.0.0-BETA1 <v6.4.40Fix Suggestion:
Update to version v6.4.40symfony/symfony (PHP):
Affected version(s) >=v8.0.0-BETA1 <v8.0.12Fix Suggestion:
Update to version v8.0.12Related Resources (11)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing
EPSS
Base Score:
0.32