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Microsoft Security Response CenterCVE-2026-54130

M365 Copilot Information Disclosure Vulnerability

Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Read the vendor bulletin Get alerts for Microsoft 365 Copilot
9.8CVSS 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-2026-54130View CVSS, KEV, EPSS, and threat context
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