CVE-2026-45063 PUBLISHED

Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator

Assigner: GitHub_M
Reserved: 08.05.2026 Published: 14.07.2026 Updated: 14.07.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 9.1

Product Status

Vendor symfony
Product symfony
Versions
  • Version < 5.4.52 is affected
  • Version >= 6.0.0-BETA1, < 6.4.40 is affected
  • Version >= 7.0.0-BETA1, < 7.4.12 is affected
  • Version >= 8.0.0-BETA1, < 8.0.12 is affected

References

Problem Types

  • CWE-290: Authentication Bypass by Spoofing CWE