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A reflected XSS vulnerability on Amazon's masclient endpoint (/gp/masclient/dp/) allows attackers to inject arbitrary HTML/JavaScript by exploiting insufficient input validation and capitalization of product IDs. The author demonstrates cookie theft and session hijacking via SVG onload attributes with HTML entity encoding to bypass browser XSS protections.

amazon.com Jonathan Bouman Scroll.am Vue.js AWS Codestar AWS Lambda Chrome XSS Auditor Firefox jscrew.it jjencode
medium.com · devanshbatham/Awesome-Bugbounty-Writeups · 20 hours ago · details