Is CVE-2026-45066 actively exploited?

No active exploitation of CVE-2026-45066 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45066 be exploited remotely?

Yes. CVE-2026-45066 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45066?

CVE-2026-45066 has a CVSS score of 6.1 (MEDIUM).

HOME VULNERABILITIESCVE-2026-45066

MEDIUM

CVE-2026-45066

CWE-184Published: July 14, 2026· Updated: Jul 16, 2026

6.1

CVSS v3.1

Official Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because <area href> is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.

NVD Source

Technical Analysis

CVE-2026-45066 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.