Information
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Advisory by Netsparker (now Invicti)
Name: Reflected XSS vulnerability in HESK help desk software
Affected Software: HESK help desk
Affected Versions: 2.6.7
Vendor Homepage: http://hesk.com
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
Invicti Advisory Reference: NS-16-012

Technical Details
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Proof of Concept URL for XSS vulnerability in HESK

URL: https://example.com/hesk/ticket.php?track=
Parameter Name: track
Parameter Type: GET
Attack Pattern: "><script>alert(document.domain)</script>

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

Advisory Timeline
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03 Aug 2016 - Issue reported
10 Aug 2016 - Issue fixed

Solution
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Patch released by HESK and announced here.

Credits & Authors
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This issue has been discovered by Sven Morgenroth 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.