CVE-2025-63589: Cmsimple-Xh Cmsimple Xh

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

A reflected XSS vulnerability exists in CMSimple_XH 1.8's index.php router when attacker-controlled path segments are not sanitized or encoded before being inserted into the generated HTML (navigation links, breadcrumbs, search form action, footer links). An attacker-controlled string placed in the URL path is reflected into multiple HTML elements, allowing execution of arbitrary JavaScript in victims' browsers visiting a crafted URL.

Affected products

• Cmsimple-Xh Cmsimple Xh: version 1.8.0 only

Published 2025-11-06. Last modified 2026-06-17.