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Vulnerabilities

Vulnerability · CVE-2026-41100

Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.

Published May 12, 2026 · catalog updated Jun 17, 2026 · 365 copilot

Check if you run it

No confirmed exploitation is on record for CVE-2026-41100. EPSS is 0.26%. Act only if a listed version of 365 copilot is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.26%
Remediation
Advisory link
Affected products
cpe microsoft/365 copilot

Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/365 copilotversion unspecified

How to fix CVE-2026-41100

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-41100. EPSS is 0.26%. Act only if a listed version of 365 copilot is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-284: Improper Access Control. EPSS 0.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 12, 2026 · NIST NVD

    Detected

    Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.

  2. Jun 17, 2026 · NIST NVD

    Updated

    Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.

Sources

  • CVE.orgVulnerability recordCVE-2026-41100

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-41100

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-41100

    Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.