Information Disclosure Vulnerability in M365 Copilot by Microsoft
CVE-2026-85887

7.7HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Copilot
Vendor
CVE Published:
17 September 2026

What is CVE-2026-85887?

An information disclosure vulnerability exists in M365 Copilot due to incorrect permission assignment for critical resources. This flaw could allow an authorized attacker to access sensitive information across a network. Organizations using this product are advised to apply the recommended patches to mitigate potential exploitation and protect sensitive data.

Affected Version(s)

Microsoft 365 Copilot -

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.