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Vulnerability of MHonArc: Cross Site Scripting of Commentize

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting via a comment of MHonArc, in order to execute JavaScript code in the context of the web site.
Impacted software: MHonArc.
Severity of this computer vulnerability: 2/4.
Creation date: 23/04/2014.
Références of this announce: VIGILANCE-VUL-14632.

Description of the vulnerability 

The MHonArc product uses a web service to display emails.

The commentize() function of the lib/ewhutil.pl file converts special characters, before injecting them in an HTML comment. However, the '<' character is not filtered.

An attacker can therefore trigger a Cross Site Scripting via a comment of MHonArc, in order to execute JavaScript code in the context of the web site.
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This threat bulletin impacts software or systems such as MHonArc.

Our Vigil@nce team determined that the severity of this computer threat bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this computer threat.

Solutions for this threat 

MHonArc: version 2.6.19.
The version 2.6.19 is fixed:
  http://www.mhonarc.org/#download

MHonArc: patch for Commentize.
A patch is available in information sources.
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