CVE-2025-63589: cmsimple xh XSS — Exploit

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.

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
cmsimple-xh	cmsimple_xh	All

References

Exploits

https://github.com/cybercrewinc/CVE-2025-63589 https://github.com/cybercrewinc/CVE-2025-63589

Other References

https://github.com/cmsimple-xh/cmsimple-xh/blob/master/index.php

Frequently Asked Questions

What is CVE-2025-63589? +

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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-63589? +

CVE-2025-63589 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-63589? +

CVE-2025-63589 affects products from cmsimple-xh, specifically: cmsimple_xh. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-63589? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-63589