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

CVE-2026-26133

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

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

HIGH · CVSS 7.1 EPSS 0.00054
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules15 YARA rules0

Affected Products & Versions

18
microsoft 365 copilot< 16.0.19815.10000
microsoft edge< 145.3800.99
microsoft excel< 16.0.19822.20038
microsoft onenote< 16.0.19725.20142
microsoft onenoteall versions

Sigma Hunt Rules

15
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious File Created in Outlook Temporary Directory
producthighSuspicious Outlook Macro Created
producthighPotential Persistence Via Outlook Form
producthighSuspicious Execution From Outlook Temporary Folder
producthighSuspicious Remote Child Process From Outlook
producthighSuspicious Outlook Child Process

Scoring & Timeline

7.1
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 Mar 2026 · 02:18 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.

Vendor Advisories

1
msrcCVE-2026-26133Information Disclosure
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