Microsoft Teams is widely deployed; CVSS 10.0 privilege escalation enabling account takeover/administrative actions can disrupt organizations.
CVE-2026-65667
Unauthorized privilege escalation in Microsoft Teams allowing remote account takeover.
Is CVE-2026-65667 being exploited?
Not confirmed. CVE-2026-65667 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.62% probability of exploitation in the next 30 days.
How severe is CVE-2026-65667?
CVE-2026-65667 is rated Critical with a CVSS score of 10.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-65667?
Yes. A fix has been recorded for CVE-2026-65667. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-65667 affect?
CVE-2026-65667 affects Microsoft Teams. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-65667?
Apply vendor patch/mitigations immediately; restrict Teams access, enforce least privilege and MFA.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote privilege escalation enabling attacker to assume higher-privilege Teams accounts: access/modify messages, join/manage meetings, perform admin actions.
Immediate action required