Is CVE-2026-45063 actively exploited?

No active exploitation of CVE-2026-45063 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45063 be exploited remotely?

Yes. CVE-2026-45063 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45063?

CVE-2026-45063 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-45063

CWE-290Published: July 14, 2026· Updated: Jul 15, 2026

9.1

CVSS v3.1

EPSS:0.34%probability of exploitation in 30 daysPercentile:25.8th

Official 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.

NVD Source

Risk Analysis

This critical vulnerability in Symfony, a PHP framework, allows an attacker to impersonate users. By crafting a special trusted certificate, an attacker can trick the system into authenticating as a legitimate user, leading to unauthorized access. The high CVSS score of 9.1 indicates a severe risk.

No public exploit is currently known for this vulnerability. However, its remote exploitability (AV:N) and low attack complexity (AC:L) make it a significant concern.

Recommended Action

Update Symfony to versions 5.4.52, 6.4.40, 7.4.12, or 8.0.12 or later to address this flaw. Ensure all web application components are kept up-to-date.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-45063 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.