Is CVE-2026-26133 actively exploited?

CVE-2026-26133 has no public evidence of in-the-wild exploitation as of 2026-04-09.

What is the CVSS score for CVE-2026-26133?

CVE-2026-26133 has a CVSS score of 7.1 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.

How do I patch CVE-2026-26133?

Patch guidance is available from microsoft security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-26133.

Fix CVE-2026-26133 - HIGH microsoft 365 copilot

Q: Which products are affected by CVE-2026-26133?

20 products: microsoft 365 copilot, microsoft 365 copilot, microsoft edge, microsoft edge, microsoft excel, and 15 more.

Description

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

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: high
Integrity: low
Availability: none
Weaknesses: CWE-77 · Command Injection CWE-77 · Command Injection

Metadata

Primary Vendor: MICROSOFT
Published: 3/16/2026
Last Modified: 4/9/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

microsoft : 365_copilotmicrosoft : 365_copilotmicrosoft : edgemicrosoft : edgemicrosoft : excelmicrosoft : excelmicrosoft : loopmicrosoft : onenotemicrosoft : onenotemicrosoft : outlookmicrosoft : outlookmicrosoft : outlookmicrosoft : power_bimicrosoft : power_bimicrosoft : powerpointmicrosoft : powerpointmicrosoft : teamsmicrosoft : teamsmicrosoft : wordmicrosoft : word

Remediation Guidance

Executive Summary

View on NIST NVD