Information
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Advisory by Netsparker (now Invicti)
Name: DOM XSS Vulnerability in iCheck
Affected Software: iCheck
Affected Versions: v1.x and possibly below
Vendor Homepage: https://github.com/fronteed/iCheck  
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Not fixed
Invicti Advisory Reference: NS-15-020

Technical Details
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Proof of Concept URL for XSS in iCheck:

/icheck-1.x/demo/#<img/src/onerror=alert(1)>

For more information on this vulnerability read the article What is DOM based Cross-site Scripting vulnerability.

Advisory Timeline
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04/09/2015 - First Contact
06/11/2015 - Second Contact
15/12/2015 - Advisory Released

Solution
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The developer did not follow up / no solution is available.

Credits & Authors
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These issues have been discovered by Onur Yilmaz 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.