Information
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Advisory by Netsparker
Name: Reflected XSS Vulnerability in PageKit 1.0.5
Affected Software : PageKit 1.0.5
Affected Versions: 1.0.5 and possibly below
Vendor Homepage : https://pagekit.com/ 
Vulnerability Type : Cross-site Scripting
Severity : Important
Status : Fixed
Netsparker Advisory Reference : NS-16-010

Technical Details
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Proof of Concept URL for XSS vulnerability in PageKit 1.0.5:

URL /pagekit-1.0.5-full/o.config
Parameter Name Referer
Parameter Type HTTP Header
Attack Pattern '"--></style></scRipt><scRipt>alert(0x0026F8)</scRipt>

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

Advisory Timeline
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04 Aug 2016 - First Contact
08 Aug 2016 - Vendor Replied
09 Aug 2016 - Advisory Released

Solution
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Patch released by PageKit and announced here.

Credits & Authors
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These issues have been discovered by Omar Kurt while testing Netsparker Web Application Security Scanner.

About Netsparker
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Netsparker web application security scanners find and report security flaws and vulnerabilities such as SQL Injection and Cross-site Scripting (XSS) in all websites and web applications, regardless of the platform and technology they are built on. Netsparker scanning engine’s unique detection and exploitation techniques allow it to be dead accurate in reporting vulnerabilities. The Netsparker web application security scanner is available in two editions; Netsparker Desktop and Netsparker Cloud. Visit our website https://www.netsparker.com for more information.