Home/CVE/Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthoriz
CVE

CVE-2026-42893

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthoriz

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.

HIGH · CVSS 7.4 EPSS 0.00054
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
▤

Affected Products & Versions

1
microsoft outlook< 5.2617.1
◈

Sigma Hunt Rules

8
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

7.4
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 NVD12 May 2026 · 06:17 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/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.
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Vendor Advisories

1
msrcCVE-2026-42893Tampering
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