Privilege escalation via undisclosed authentication flaw

Improper authentication in Microsoft Teams allows remote authenticated users to gain elevated privileges over a network. Microsoft has not disclosed the affected Teams component or the authentication check that improperly accepts attacker-controlled requests, so the public record does not expose a narrower locus than the service itself. The published CVSS 3.1 vector requires only low privileges and no user interaction, and the disclosed impact is privilege escalation in Microsoft's hosted Teams environment rather than client-side code execution or service interruption.