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.
Affected products
cmsimple-xh: cmsimple xh
References3
- github.com/cybercrewinc/CVE-2025-63589 ExploitThird Party Advisory
- github.com/cybercrewinc/CVE-2025-63589 ExploitThird Party Advisory
- github.com/cmsimple-xh/cmsimple-xh/blob/master/index.php Product
Metrics
- CVSS 3.1
-
7.1
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N - EPSS — exploit probability
- 0% percentile: 29 · as of 10 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.