Critical 9.1Published Jul 14, 2026

CVE-2026-45063Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator

Updated under an hour ago (Oct 27, 2026, 3:40 AM ET)

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Every CVE for symfony

Exploited in the last 30 days

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: 9.1 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-290
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

symfony symfony symfony:symfony (from the name)	before 5.4.52; from 6.0.0-BETA1, < 6.4.40; from 7.0.0-BETA1, < 7.4.12; from 8.0.0-BETA1, < 8.0.12	CNA record
sensiolabs symfony sensiolabs:symfony	before 5.4.52; from 6.0.0 before 6.4.40; from 7.0.0 before 7.4.12; from 8.0.0 before 8.0.12	NVD

References

References

https://github.com/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2	x-refsource-confirm, patch, vendor-advisory
https://github.com/symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5a0d	x-refsource-misc, patch
https://github.com/symfony/symfony/releases/tag/v5.4.52	x-refsource-misc, product, release-notes
https://github.com/symfony/symfony/releases/tag/v6.4.40	x-refsource-misc, product, release-notes
https://github.com/symfony/symfony/releases/tag/v7.4.12	x-refsource-misc, product, release-notes
https://github.com/symfony/symfony/releases/tag/v8.0.12	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.