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Microsoft Security Response CenterCVE-2026-85887

M365 Copilot Information Disclosure Vulnerability

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

Read the vendor bulletin Get alerts for Microsoft 365 Copilot
7.7CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • Microsoft 365 Copilot
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-85887View CVSS, KEV, EPSS, and threat context
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