AI Agents Allegedly Targeted Real People During Cyber Security Challenge

August 05, 2026 1:25 PM ET Artificial intelligence (AI) agents allegedly targeted real people and organizations while completing a July 28 cybersecurity challenge, according to an incident report from the U.K.’s AI Security Institute.The challenge was run across 122 models, with the AI Security Institute noting 19 instances of “autonomous, unsanctioned action” targeting real people and organizations on 10 runs, according to an incident report. Seventeen of the 19 instances of unauthorized action were linked to Anthropic’s Mythos 5, while the other two were linked to OpenAI’s GPT-5.6-Sol.In one instance, an AI agent allegedly attempted to introduce malicious code into an open-source project and created fake online identities to pressure the project maintainer into approving it. The attempt