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

ID VU:107998
Type cert
Reporter CERT
Modified 2004-11-03T00:00:00



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.

Systems Affected

Vendor| Status| Date Notified| Date Updated
MailPost| | 13 Aug 2004| 03 Nov 2004
If you are a vendor and your product is affected, let us know.

CVSS Metrics

Group | Score | Vector
Base | N/A | N/A
Temporal | N/A | N/A
Environmental | N/A | N/A


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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: Unknown
  • Date Public: 03 Nov 2004
  • Date First Published: 03 Nov 2004
  • Date Last Updated: 03 Nov 2004
  • Severity Metric: 14.85
  • Document Revision: 3