Anthropic’s browser agent got hijacked 31.5% of the time before safeguards engaged

Anthropic’s browser agent got hijacked 31.5% of the time before safeguards engaged
Published in : 01 Jun 2026

Anthropic’s browser agent got hijacked 31.5% of the time before safeguards engaged

Across the frontier labs, the highest prompt injection figures published this spring are Anthropic’s. Point a red-teamer at its newest model in a browser, and the attacker hijacked it 31.5% of the time before safeguards ...

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