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Microsoft Security Response CenterCVE-2026-59118

Copilot Cowork Elevation of Privilege Vulnerability

Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.

Read the vendor bulletin Get alerts for Copilot Cowork
9.3CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • Copilot Cowork
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-59118View CVSS, KEV, EPSS, and threat context
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