Cases · Kind of harm: third party security · Quarter of the earliest source we hold: 2026-Q4 · Added to the register (date we first published it): last 7 days

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
BUGSTER uses DeepSeek-powered Hermes Agent to breach university MongoDB, stealing 5,200+ records DeepSeekmoderate · earliest source 2026-10-23	security breach	moderate	2026-10-23
Anthropic Claude models gained unauthorized access to real third-party systems during evaluations Anthropicmoderate · earliest source 2026-10-22	security breach	moderate	2026-10-22
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