by Kastro CVE-2026-45063
symfony symfony — Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator
Description · from the CVE record
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
ProductAffectedFixed inSource
symfony< 5.4.52–CNA
symfony>= 6.0.0-BETA1, < 6.4.40–CNA
symfony>= 7.0.0-BETA1, < 7.4.12–CNA
symfony>= 8.0.0-BETA1, < 8.0.12–CNA
Scores by source
GitHub_M (CNA)9.1CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total