CVE-2026-26133 — M365 Copilot Information Disclosure Vulnerability

Executive Summary

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

Overview

7.1

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Mar 10 2026

Last Updated Mar 10 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00433 — 0.3441 percentile

NVD CVSS 7.1 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

Low

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.2

EPSS Score

0.00433

probability of exploitation in the next 30 days

0.3441 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

20 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft 365 Copilot for Android	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft 365 Copilot for iOS	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Edge for Android	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Edge for iOS	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Excel for Android	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Excel for iOS	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Loop for iOS	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft OneNote for Android	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft OneNote for iOS	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Outlook for Android	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Outlook for iOS	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Outlook for Mac	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft PowerBI for Android	`Release Note (Security Update)`	Important	Information Disclosure	Maybe
Microsoft PowerBI for iOS	`Release Note (Security Update)`	Important	Information Disclosure	Maybe
Microsoft PowerPoint for Android	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft PowerPoint for iOS	`Release Note (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Teams for Android	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Teams for iOS	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Word for Android	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Word for iOS	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe

Patches

2 patches

Article	Type	Restart
`Release Notes`	Security Update	Maybe
`Release Note`	Security Update	Maybe

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Microsoft has not published researcher acknowledgments for this CVE, or they are not yet reflected in our data source. Check the MSRC advisory directly for the most current credit information.

References

MSRC Advisory MITRE NVD