cPanel – cPAddons Moderation Stored XSS (R911-0137)

Type: XSS
Location: Remote
Impact: High
Product: cPanel
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version:, &
CVE: -
R911: 0137
Date: 2014-03-31
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:

It is possible for a malicious user to create a stored XSS vulnerability within the cPAddons moderation files which could cause dangerous code to be rendered within the administrators web browser when using WHM.


We have deemed this vulnerability to be rated as HIGH due to the fact that dangerous code can be rendered within the administrators web browser.

Vulnerable Version:

This vulnerability was tested against cPanel 11.40.0 #19 and is believed to exist in all versions prior to the fixed builds below.

Fixed Version:

This vulnerability was patched in cPanel, &

Vendor Contact Timeline:

2014-02-15: Vendor contacted via email.
2014-02-18: Vendor confirms vulnerability.
2014-03-24: Vendor issues updates to all builds.
2014-03-31: Rack911 issues security advisory.