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Vulnerabilities

Vulnerability · CVE-2026-26133

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

Published Mar 16, 2026 · catalog updated Jun 17, 2026 · 365 copilot

Check if you run it

No confirmed exploitation is on record for CVE-2026-26133. EPSS is 0.56%. Act only if a listed version of 365 copilot is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.56%
Remediation
Advisory link
Affected products
cpe microsoft/365 copilot · cpe microsoft/edge · cpe microsoft/excel · cpe microsoft/loop · cpe microsoft/onenote

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/365 copilotversion unspecified
  • cpe microsoft/edgeversion unspecified
  • cpe microsoft/excelversion unspecified
  • cpe microsoft/loopversion unspecified
  • cpe microsoft/onenoteversion unspecified

How to fix CVE-2026-26133

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-26133. EPSS is 0.56%. Act only if a listed version of 365 copilot is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-77: Command Injection. EPSS 0.56%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 16, 2026 · NIST NVD

    Detected

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

  2. Jun 17, 2026 · NIST NVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2026-26133

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-26133

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-2026-26133

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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.