Microsoft Copilot reveals secret input that allowed it to be hacked

Microsoft Copilot reveals secret input that allowed it to be hacked. It centres on Microsoft, and also names GitHub Copilot. Reported by Ars Technica. Bharat Hunt files it under AI Coding — the section covering code generation, developer agents, IDEs and software engineering.
Written by Bharat Hunt from the headline and the coverage below. The original reporting is the source of truth.