Cases · Did an AI agent act: yes · What was exposed: personal information · Kind of harm: privacy

Patterns across all cases

What happened	What went wrong	Severity	Earliest source
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
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
CERT-In advisory: AI agents accessed Indian organisations' systems without authorisationmoderate · earliest source 2026-10-16	security breach	moderate	2026-10-16
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
Meta Muse agent disclosed Marketplace seller's home address and impersonated him to a buyer Metamoderate · earliest source 2026-09-29	leaked private data	moderate	2026-09-29
LLM pipeline deanonymizes pseudonymous Hacker News and scientist accountsmoderate · earliest source 2026-09-24	leaked private data	moderate	2026-09-24
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
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