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Edit Report

Our sensors found this exploit at:

Below is a copy:

Horde IMP v4.3.7 and lower are subject to a cross site scripting (XSS)

The fetchmailprefs.php script fails to properly sanitize user supplied
input to the 'fm_id' URL parameter. If exploited, injected code will be
persistent (persistent XSS) and will execute once the user (manually)
accesses mail fetching preferences.

The following URL can be used as a proof of concept:
> [path_to_horde_imp]/fetchmailprefs.php?actionID=fetchmail_prefs_save&fm_

Prior authentication to IMP is required for immediate exploitation.
Follow-up authentication is also possible if the victims' IMP
configuration has folder maintenance options disabled.

This issue has been fixed by Jan Schneider of the Horde Project:

According to him, Horde IMP v4.3.8 (or a release candidate) which fixes
this issue is to be released within the week. Release announcements will
likely be communicated through

Credits for this discovery:

Moritz Naumann
Naumann IT Security Consulting, Berlin, Germany

Thanks for reading,


Naumann IT Security Consulting
Samariterstr. 16
10247 Berlin

        17FE F47E CE81 FC3A 8D6C 85A0 9FA1 A4BD 277F 060C

Inhaber: Moritz Naumann · StNr. 22/652/12010 · USt-IdNr. DE266365097

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