Information
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Advisory by Netsparker (now Invicti)
Name: Open Redirection Vulnerability in SmartStore
Affected Software: SmartStore
Affected Versions: v2.5.0 and possibly below
Vendor Homepage: http://www.smartstore.com/net/en/
Vulnerability Type: Open Redirection
Severity: Important
Status: Fixed
Invicti Advisory Reference: NS-16-005

Technical Details
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Proof of Concept URLs for Open Redirection vulnerability in SmartStore v2.5.0:

URL /changecurrency/1?returnurl=http://r87.com/?
Parameter Name returnurl
Parameter Type GET
Attack Pattern http://r87.com/?

For more information on Open Redirection, vulnerability read the article Open Redirection.

Advisory Timeline
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09 May 2016 - First Contact
12 May 2016 - Vendor Fixed
12 May 2016 - Advisory Released

Solution
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Patch released by SmartStore and announced here.

Credits & Authors
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These issues have been discovered by Alperen 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.