CVE-2026-26133

HIGH

M365 Copilot Information Disclosure Vulnerability

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
M365 Copilot Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26133

Scores

CVSS v3 7.1
EPSS 0.0005
EPSS Percentile 17.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-77
Status published
Products (38)
microsoft/365_copilot < 16.0.19815.10000
microsoft/365_copilot < 2.107.2
microsoft/edge < 145.3800.99 (2 CPE variants)
microsoft/excel < 16.0.19822.20038
microsoft/excel < 2.106.2
microsoft/loop < 2.106
Microsoft/Microsoft 365 Copilot for Android 1.0 - 16.0.19815.10000
Microsoft/Microsoft 365 Copilot for iOS 1.0 - 2.107.2
Microsoft/Microsoft Edge for Android 1.0.0 - 145.3800.99
Microsoft/Microsoft Edge for iOS 1.0.0.0 - 145.3800.99
... and 28 more
Published Mar 16, 2026
Tracked Since Mar 16, 2026