🟠 High | Source: Microsoft Security Response Center
A vulnerability in Microsoft Teams allows an attacker on the same network to spoof messages or identities by exploiting improper verification of cryptographic signatures. This means communications that appear to come from a trusted source could in fact originate from a malicious actor. In enterprise environments where Teams is central to business communication, this creates a credible phishing and social engineering vector.
Security Architect’s Take: Ensure Microsoft Teams is fully patched to the latest version across all endpoints and verify that auto-update policies are enforced via Intune or your endpoint management platform. Additionally, review any conditional access policies to limit Teams access to managed, compliant devices, reducing exposure in cases where patching lags.
Original advisory: CVE-2026-62918 Microsoft Teams Spoofing Vulnerability