error-message-reflection

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A DOM-based XSS vulnerability in a Cloudflare-protected login page where a reflected error message parameter is directly inserted into JavaScript without filtering, allowing attackers to bypass the WAF by breaking out of a JavaScript alert() function context and executing arbitrary code.

Cloudflare KatsuragiCSL
medium.com · devanshbatham/Awesome-Bugbounty-Writeups · 12 hours ago · details