Prompt Injection Vulnerability in Claude Code Opus 5
September 1, 2026
Claude Code Opus 5 in Auto Mode shows a 60-80% success rate for prompt injection attacks. This vulnerability contradicts current safety claims regarding autonomous agent modes.
HOW THIS AFFECTS YOU
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builderDo not deploy autonomous agents with write access to sensitive environments without additional sandboxing.
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policyThis highlights a significant gap between theoretical safety alignment and practical agentic security.