cPanel – FTP Session Control Stored XSS (R911-0156)

Type: XSS
Location: Remote
Impact: Medium
Product: cPanel
Vulnerable Version: All versions prior to the fixed builds below.
Fixed Version:, &
CVE: -
R911: 0156
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:

It is possible for a malicious user to create an XSS by spoofing various FTPD processes containing an XSS string. Should the root user log into the cPanel account and access the FTP Session Control, then the XSS attack will be performed against them.


We have deemed this vulnerability to be rated as MEDIUM due to the fact that malicious HTML can be rendered against the root user under certain circumstances.

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:

2014-04-03: Vendor contacted via email.
2014-04-07: Vendor confirms vulnerability.
2014-05-19: Vendor issues updates to all builds.
2014-05-26: Rack911 issues security advisory.