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CVE-2026-45063

9.1 · CRITICAL

Symfony is a PHP framework for web and console applications and a set of reusable PHP components.

Published Jul 14, 2026CWE-290EPSS 0.37%

Overview

CVE-2026-45063 is a critical-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/symfony/symfony/commit/59ef484029601a7af06f5e06c6ed921fdcea5a0dGitHubgithub.com/symfony/symfony/releases/tag/v5.4.52GitHubgithub.com/symfony/symfony/releases/tag/v6.4.40GitHubgithub.com/symfony/symfony/releases/tag/v7.4.12GitHubgithub.com/symfony/symfony/releases/tag/v8.0.12GitHubgithub.com/symfony/symfony/security/advisories/GHSA-ph86-p8f6-f9r2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45063?

CVE-2026-45063 is a critical-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-45063?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-45063?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-45063?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45063 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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