Spoofing via improper signature verification

Spoofing in Microsoft Teams allows remote attackers to impersonate trusted content over a network via improper signature verification. Microsoft and NVD have not disclosed the affected Teams component or the code path that accepts a malformed or attacker-controlled signature, so the concrete verification failure remains undisclosed. The published CVSS vector indicates unauthenticated network reachability and integrity-only impact, but the public record does not show whether exploitation depends on a particular Teams feature, message flow, or service-side workflow.