🟠 High | Source: Microsoft Security Response Center
A vulnerability in Microsoft Teams allows an already-authenticated attacker to gain higher-level privileges than they should have, purely over the network and without requiring physical access. This is concerning because Teams is widely used across enterprise environments, meaning a compromised or malicious insider account could leverage this flaw to escalate access significantly. The blast radius could be substantial in organisations where Teams is integrated with other Microsoft 365 and Azure services.
Security Architect’s Take: Ensure Microsoft Teams clients and server-side components are patched to the latest version immediately, and review audit logs for any anomalous privilege changes or unusual activity from authenticated user accounts in Teams. Consider applying conditional access policies and least-privilege principles to limit what elevated permissions could realistically be abused in your environment.
Original advisory: CVE-2026-62896 Microsoft Teams Elevation of Privilege Vulnerability