portswigger.net/research· Aug 26, 2025

Inline Style Exfiltration: leaking data with chained CSS conditionals

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I discovered how to use CSS to steal attribute data without selectors and stylesheet imports! This means you can now exploit CSS injection via style attributes! Learn how below: Someone asked if you c
🎯 Vulnerability: Web Security Vulnerability
💡 Defense Fix: Implement strict input validation, contextual output encoding, and enforce least-privilege authorization controls.