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Microsoft Security Response CenterCVE-2026-26133

M365 Copilot Information Disclosure Vulnerability

AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Read the vendor bulletin Get alerts for Microsoft OneNote for iOS
7.1CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft OneNote for iOS
  • Microsoft Outlook for Mac
  • Microsoft Outlook for Android
  • Microsoft 365 Copilot for iOS
  • Microsoft Edge for Android
  • Microsoft Teams for iOS
  • Microsoft Teams for Android
  • Microsoft Excel for Android
  • Microsoft Word for Android
  • Microsoft PowerPoint for iOS
  • Microsoft Word for iOS
  • Microsoft Loop for iOS
  • Microsoft Outlook for iOS
  • Microsoft 365 Copilot for Android
  • Microsoft PowerBI for Android
  • Microsoft PowerBI for iOS
  • Microsoft OneNote for Android
  • Microsoft Edge for iOS
  • Microsoft PowerPoint for Android
  • Microsoft Excel for iOS

Versions the vendor lists as fixed

  • 2.106.26020617
  • 5.2605
  • 2.107.2
  • 145.3800.99
  • 8.3.1
  • 1.0.0.2026043102
  • 16.0.19822.20038
  • 16.0.19815.10000
  • 2.2.260210.21290750
  • 1.2.260302.2193910
  • 16.0.19725.20142
Next step

What the vendor recommends

Release Notes Release Note

Review the complete instructions on the vendor's site
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-2026-26133View CVSS, KEV, EPSS, and threat context
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