What is CVE-2026-85887?

CVE-2026-85887 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. M365 Copilot Information Disclosure Vulnerability

Which CVE IDs does CVE-2026-85887 cover?

CVE-2026-85887 covers the following CVE IDs: CVE-2026-85887. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-85887?

CVE-2026-85887 has a CVSS v3 base score of 7.7, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-85887?

CVE-2026-85887 affects 1 product, including: Microsoft 365 Copilot.

CVE-2026-85887CriticalCVSS 7.7

M365 Copilot Information Disclosure Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

September 17, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-85887 →

📋 Description

Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.

🎯 Affected products1

Microsoft 365 Copilot

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85887