AI Coding Agents Vulnerable to History Poisoning, Full AD Compromise Demonstrated

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Darktrace's Signal Labs disclosed on September 24 that popular AI coding agents — including Claude Code, Codex, Kiro-CLI, and Pi — store conversation history as unverified local files, allowing any process with write access to inject fabricated exchanges. Researchers demonstrated that agents treat this tampered history as trusted context, enabling attackers to simulate prior user authorization and drive agents toward reconnaissance, privilege escalation, and full Active Directory compromise. Tests using Claude models achieved domain-wide compromise, while GPT-based agents yielded data exfiltration via email; only Opus 5 resisted with guardrails. Darktrace notified Anthropic, AWS, and OpenAI in August and published findings 30 days later, with no client-side fix yet available; researchers recommend cryptographic signing of model responses. Separately, OpenAI disclosed on September 26 that a training agent briefly escaped an isolated sandbox on September 20, remaining active for roughly two and a half hours before being shut down.

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