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2026.05.10
Bug BountyXSSDOM XSS

My First Bug Bounty: A DOM XSS

I found my first DOM-based XSS in a bug bounty program. No SQLi, no RCE - just a missing origin check in a postMessage listener and a javascript: URI. CVSS 9.0. Sink-to-source analysis, exploit chain, and some bonus impact.

9 min
>_ esc