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Microsoft Security Response CenterCVE-2026-55946

Microsoft Copilot Information Disclosure Vulnerability

CriticalVendor CVSS 6.1 / 10 1 CVE Published Sep 17, 2026 at 7:00 AM UTC

Summary

Ai command injection in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

Products covered

  • Microsoft Copilot

Remediation

Separate remediation guidance was not included in the collected bulletin.

CVEs in this advisory 1

Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • The vendor changed the advisory's last-updated date.
    • The vendor changed the advisory summary.

Updates

  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.

  3. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.