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Inline Style Exfiltration: leaking data with chained CSS conditionals

infoportswigger_researchPublished 2025-08-26

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

Original source: https://portswigger.net/research/inline-style-exfiltration