Cases · Did an AI agent act: yes · Kind of harm: third party security · Severity: major

Patterns across all cases

What happened	What went wrong	Severity	Earliest source
Indonesian-speaking operator uses Claude Code to compromise Indonesian and Bangladeshi government domains Anthropicmajor · earliest source 2026-10-26	security breach	major	2026-10-26
Self-taught hacker uses AI coding agent and autonomous penetration-testing system to breach 90+ companies and steal 8.2 million recordsmajor · earliest source 2026-10-26	security breach	major	2026-10-26
OpenAI research model escapes to live internet via DNS misconfiguration during training OpenAImajor · earliest source 2026-10-25	security breach	major	2026-10-25
Storm-0940 uses ARTEX agentic AI framework to automate cross-tenant password spraying and OAuth application abusemajor · earliest source 2026-10-22	security breach	major	2026-10-22
ARTEX autonomous penetration-testing agent used in attacks on South Korean financial institutionsmajor · earliest source 2026-10-21	security breach	major	2026-10-21
Autonomous AI agent campaign (AIA0001) compromises 100+ company websites via Cairn platformmajor · earliest source 2026-10-20	security breach	major	2026-10-20
AgentCorruption: prompt-injected Bedrock AgentCore agent exfiltrates execution-role credentials via IMDS Amazonmajor · earliest source 2026-10-10	security breach	major	2026-10-10
Meta Muse AI agent KVM escape vulnerability discovered before launch Metamajor · earliest source 2026-10-08	security breach	major	2026-10-08
AI agent (ARTEX with Claude) used in cyberattacks targeting South Korean banks Anthropicmajor · earliest source 2026-10-05	security breach	major	2026-10-05
AI agent breach of KB Kookmin Bank mobile work support systemmajor · earliest source 2026-10-04	security breach	major	2026-10-04
OpenAI agents attempt to exfiltrate data from public databases and breach Australian government systems OpenAImajor · earliest source 2026-09-25	security breach	major	2026-09-25
Claude Code used by Yemen-based actors to develop guided-weapon GNC software Anthropicmajor · earliest source 2026-09-14	produced harmful content	major	2026-09-14
OpenAI evaluation agents exploited Artifactory zero-days to escape their sandbox and reach the internet OpenAImajor · earliest source 2026-07-21	AI pursued the wrong goal	major	2026-07-21
OpenAI evaluation agents compromised Hugging Face production infrastructure while seeking ExploitGym solutions OpenAImajor · earliest source 2026-07-16	AI pursued the wrong goal	major	2026-07-16
Jailbroken Claude used to breach Mexican government networks and steal taxpayer and voter records Anthropicmajor · earliest source 2026-03-02	security breach	major	2026-03-02
Nx s1ngularity: malicious npm packages drove local AI coding CLIs to enumerate secrets for exfiltrationmajor · earliest source 2025-08-27	security breach	major	2025-08-27