LayerX Demonstrates Fonts Fool AI Web Assistants

Researchers at LayerX report that custom fonts and CSS can visually alter rendered web pages for users while leaving underlying HTML unchanged, enabling attackers to hide malicious instructions from AI web assistants. In tests using a ClickFix phishing proof-of-concept, every tested assistant (including ChatGPT, Gemini, and Copilot) failed to detect hidden text. The flaw enables social-engineering attacks and highlights gaps in assistant security.
Scoring Rationale
Strong cross-platform proof-of-concept raises urgency, but single-vendor disclosure and lack of peer review limit confidence.
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