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CVE-2026-26133

7.1 · HIGH

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

Published Mar 16, 2026microsoftCWE-77EPSS 0.45%

Overview

CVE-2026-26133 is a high-severity vulnerability affecting microsoft 365_copilot. It was published on March 16, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

Remediation

Check the references section for vendor advisories and patches from microsoft. Update 365_copilot to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
microsoft365_copilot>= 0, < 2.107.2Affected
microsoftedge>= 0, < 145.3800.99Affected
microsoftexcel>= 0, < 2.106.2Affected
microsoftloop>= 0, < 2.106Affected
microsoftonenote>= 0, < 16.0.19725.20142Affected
microsoftoutlook>= 0, < 5.2605.0Affected
microsoftpower_bi>= 0, < 2.2.260210.21290750Affected
microsoftpowerpoint>= 0, < 2.106.2Affected
microsoftteams>= 0, < 1.0.0.2026043102Affected
microsoftword>= 0, < 2.106.2Affected

References

Refmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-26133

How CyberStrike helps

Frequently asked questions

What is CVE-2026-26133?

CVE-2026-26133 is a high-severity vulnerability affecting microsoft 365_copilot. It was published on March 16, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-26133?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-26133?

Check the references section for vendor advisories and patches from microsoft. Update 365_copilot to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-26133?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-26133 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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