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CERT Coordination Center

MailPost vulnerable to cross-site scripting in the 'append' variable passed to the file as part of an HTTP GET request

Vulnerability Note VU#107998

Original Release Date: 2004-11-03 | Last Revised: 2004-11-03


A cross-site scripting vulnerability is reported to exist in MailPost version 5.1.1sv and possibly earlier versions.


According to a report by ProCheckUp, MailPost is vulnerable to a Cross-Site Scripting attack via the 'append' variable. The 'append variable is passed as part of an HTTP GET request when the debug mode is enabled. In debug mode, the variables passed to the script are echoed to the screen without any filtering. Note that debug mode is enabled in the default configuration file.


The victim site may present malicious content to their visitors. This could be used to "sniff" sensitive data from within the web page and cookie files, including passwords, credit card numbers, and any arbitrary information the user inputs.


The CERT/CC is currently unaware of a practical solution to this problem.

Until a resolution can be applied it may be possible to mitigate this vulnerability by disabling debug mode.

Vendor Information


MailPost Affected

Notified:  August 13, 2004 Updated: November 03, 2004



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

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Thanks to ProCheckUp for reporting this vulnerability.

This document was written by Jason A Rafail and is based on information provided by ProCheckUp.

Other Information

CVE IDs: None
Severity Metric: 14.85
Date Public: 2004-11-03
Date First Published: 2004-11-03
Date Last Updated: 2004-11-03 15:41 UTC
Document Revision: 3

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