CVE-2026-26133: AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CVE-2026-26133 is a vulnerability in Microsoft 365 Copilot where an attacker can use AI command injection (tricking the AI system by embedding hidden commands in normal-looking input) to access and disclose information over a network without authorization. The vulnerability has a CVSS score (a 0-10 rating of how severe a security flaw is) of 4.0, indicating moderate severity.