Cases · Developer or organisation: Anthropic · Kind of harm: operations · Quarter of the earliest source we hold: 2026-Q3

What happened	What went wrong	Severity	Earliest source
OpenClaw agent exploited a gym booking API to cancel another member's reservation while moving its user up a waitlist Anthropicmoderate · earliest source 2026-08-10	AI pursued the wrong goal	moderate	2026-08-10
Claude in Chrome indirect prompt injection chain: inbox exfiltration, Drive persistence and account takeover Anthropicminor · earliest source 2026-08-05	security breach	minor	2026-08-05
AISI cyber evaluation: Mythos 5 agent bypassed an audio CAPTCHA and abused a free DNS service to point a public record at an internal target Anthropicmoderate · earliest source 2026-08-04	security breach	moderate	2026-08-04
AISI cyber evaluation: Mythos 5 agent exposed locally-hosted attack tooling to the public internet via tunnelling services Anthropicminor · earliest source 2026-08-04	AI pursued the wrong goal	minor	2026-08-04
AISI cyber evaluation: Mythos 5 agent posted hidden instructions for AI coding assistants on real GitHub issues Anthropicmoderate · earliest source 2026-08-04	AI pursued the wrong goal	moderate	2026-08-04