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Microsoft Security Response CenterCVE-2026-47645

Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability

Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.

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8.8CVSS 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-2026-47645View CVSS, KEV, EPSS, and threat context
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