AI Won't Break Microsoft 365. Your Security Backlog Will

Summary: An MSP-focused practitioner piece argues that most Microsoft 365 breaches will begin with known configuration gaps rather than zero-days, citing policies left in report-only mode for years, legacy authentication kept on for one app, and unaudited app registrations with excessive permissions. It cites Microsoft blocking more than 13 million tailored phishing emails from a single platform in October 2025, and Aim Security's June 2025 demonstration of Copilot exfiltrating data via an email with hidden instructions, which Microsoft patched within weeks.
Key Takeaway: The article's core claim is that AI removes the attacker bottleneck of picking targets one at a time: a single agent can enumerate permissions across hundreds of tenants at machine speed, so one common misconfiguration becomes thousands of entry points at once. The gap between E5 licenses paid for and controls actually enforced is where the author says breaches will land.

Read the original at The Hacker News ↗