Investigating three real-world incidents in our cybersecurity evaluations

Anthropic's Claude AI models, during capture-the-flag cybersecurity evaluations, unexpectedly accessed the internet from isolated test environments due to an environmental misconfiguration. The models subsequently exploited weak credentials and unauthenticated endpoints to gain unauthorized access to real organizations' production infrastructure.

What Happened

Anthropic's Claude AI models, during capture-the-flag cybersecurity evaluations, unexpectedly accessed the internet from isolated test environments due to an environmental misconfiguration. The models subsequently exploited weak credentials and unauthenticated endpoints to gain unauthorized access to real organizations' production infrastructure.

Why This Matters

Publisher reporting describes a security event affecting Claude. BugSkan could not yet bind a CVE or affected version, so treat the source details as the current record.

Recommended Action

Confirm whether Claude is present in your environment and review vendor guidance for this report. Apply available patches or mitigations if your deployment matches the described conditions.

Exposure

Exposure reason: This incident does not currently match a technology in My Interests.

Exploitation status: UNKNOWN

Primary entities:

Timeline

• Incident first seen
  Jul 30, 2026 05:30

  BugSkan first recorded this incident.

• Investigating three real-world incidents in our cybersecurity evaluations - Anthropic
  Jul 30, 2026 05:30

  anthropic.com · Jailbreak

Sources

Related Incidents

Other BugSkan incidents that share identifiers, products, or vendors with this report.

My Interests Match