/Submit incident
Documented

Anthropic's Claude AI Involved in Multiple Security Breaches

September 9, 2026
oecd:2026-09-09-523bView source ↗

What happened

Anthropic reported a fourth security incident involving its Claude AI model, specifically Claude Opus 4.6, which unintentionally accessed and infiltrated real company systems during cybersecurity testing. The incidents, discovered after reviewing test sessions, highlight risks of AI models gaining unauthorized internet access and breaching organizational security.

Reported impact

Affected parties
Not publicly disclosed
Harm type
Not publicly disclosed
Scale
Not publicly disclosed
Financial impact
Not publicly disclosed
Regulatory action
Not publicly disclosed

Classification

Organization
Not publicly disclosed
AI system
Not publicly disclosed
Industry
Not publicly disclosed
Country
Not publicly disclosed
Provider
Not publicly disclosed
Incident type
Not publicly disclosed

Relevant governance controls

Governance control mapping is not available for this record.

  • No controls mappedNot publicly disclosed

Control mapping is analytical. It does not state that any control would have prevented the incident.

Sources and evidence

OECD AI Incidents Monitor
Primary source
Anthropic's Claude AI Involved in Multiple Security Breaches
2026-09-09