cPanel – DNS Cluster Trust Relationship Stored XSS (R911-0159)

Type: XSS
Location: Local
Impact: Medium
Product: cPanel
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version:, &
CVE: -
R911: 0159
Date: 2014-05-26
By: Rack911

Product Description:

cPanel is an easy-to-use control panel that gives web hosts and the website owners they serve, the ability to quickly and easily manage their servers and websites. Web Host Manager (WHM) is a part of the cPanel software, often used by resellers and system administrators.

Vulnerability Description:

Should any malicious HTML find it’s way into the hostname being used by a server configured within a cluster, it could then potentially render an XSS attack within the administrator’s web browser when viewing the trustclustermaster.cgi feature.


We have deemed this vulnerability to be rated as MEDIUM due to the fact that malicious HTML can be rendered in an administrators web browser.

Vulnerable Version:

This vulnerability was tested against cPanel prior to the fixed versions below.

Fixed Version:

This vulnerability was patched in cPanel, &

Vendor Contact Timeline:

2014-04-06: Vendor contacted via email.
2014-04-08: Vendor confirms vulnerability.
2014-05-19: Vendor issues updates to all builds.
2014-05-26: Rack911 issues security advisory.