CVE-2025-66686 Cross-site scripting in n/a

Medium 6.1 Published 7 Jan 2026 Updated 7 Jan 2026

An authenticated admin can inject malicious JavaScript into the Help button URL, leading to session hijacking and privilege escalation for other users.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-66686?

CVE-2025-66686 is a medium-severity cross-site scripting vulnerability in n/a, published on 7 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A stored Cross-Site Scripting (XSS) vulnerability exists in Perch CMS version 3.2. An authenticated attacker with administrative privileges can inject malicious JavaScript code into the “Help button url” setting within the admin panel. The injected payload is stored and executed when any authenticated user clicks the Help button, potentially leading to session hijacking, information disclosure, privilege escalation, and unauthorized administrative actions.

Weakness: CWE-79

Which versions are affected by CVE-2025-66686?

It affects 1 product.

Products include Grabaperch Perch.

How do I fix CVE-2025-66686?

No fix has been published for CVE-2025-66686 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-66686 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66686 exists.

Sources

Also known as GHSA-h38c-m43h-44mc.