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CVE-2026-45063Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator
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.
9.1 CRITICALEPSS 0.34%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.1 | CRITICAL | 4.0GitHub_M (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 |
| 9.1 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Details
- CVE ID
- CVE-2026-45063
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 14, 2026
- Last modified
- 2026-07-15 15:01 UTC
- Weaknesses
- CWE-290 · Authentication Bypass by Spoofing
Affected Products
As published by the CNA in the CVE record.
symfonysymfony4 version ranges
- < 5.4.52
- >= 6.0.0-BETA1, < 6.4.40
- >= 7.0.0-BETA1, < 7.4.12
- >= 8.0.0-BETA1, < 8.0.12
References
- github.com https://github.com/symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5a0d
- github.com https://github.com/symfony/symfony/releases/tag/v5.4.52
- github.com https://github.com/symfony/symfony/releases/tag/v6.4.40
- github.com https://github.com/symfony/symfony/releases/tag/v7.4.12
- github.com https://github.com/symfony/symfony/releases/tag/v8.0.12
- github.com https://github.com/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2