A reflected XSS vulnerability exists in CMSimple_XH 1.8's index.php router...

Vulnerability Description

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.

References

• https://github.com/cmsimple-xh/cmsimple-xh/blob/master/index.php
• https://github.com/cybercrewinc/CVE-2025-63589