CVE-2026-50517

A critical vulnerability exists in M365 Copilot, where deserialization of untrusted data can be exploited by an authorized attacker to execute arbitrary code remotely. This poses a significant risk to the integrity and confidentiality of affected systems, making it imperative for organizations utilizing M365 Copilot to prioritize immediate remediation efforts. Security teams should assess their environments for potential exploitation and implement necessary patches or mitigations.