CVE-2026-65667Network attack vector

Privilege escalation via missing authorization

Published Aug 6, 2026 · Updated Aug 25, 2026

Missing authorization in Microsoft Teams allows remote attackers to elevate privileges over a network without authentication. Microsoft has disclosed only that an authorization check is absent; the affected Teams endpoint, action, or trust boundary has not been publicly identified. NVD tags the issue as an exclusively hosted service, so applicability tracks use of the Teams cloud service rather than a customer-managed deployment, and published scoring bounds the impact to confidentiality and integrity compromise rather than service interruption.

CVSS severity10.0
Critical
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Microsoft Teams allows remote attackers to elevate privileges over a network without authentication. Microsoft has disclosed only that an authorization check is absent; the affected Teams endpoint, action, or trust boundary has not been publicly identified. NVD tags the issue as an exclusively hosted service, so applicability tracks use of the Teams cloud service rather than a customer-managed deployment, and published scoring bounds the impact to confidentiality and integrity compromise rather than service interruption.

The record

CVE
CVE-2026-65667
Published
Aug 6, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

10.0Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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