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HIGH · 7.4

CVE-2026-42893

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

Vulnerability Description

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

CVSS Score

7.4

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE

Affected Products

VendorProductVersions
MicrosoftOutlook< 5.2617.1

Related Weaknesses (CWE)

CWE-77

References

FAQ

What is CVE-2026-42893?

CVE-2026-42893 is a vulnerability with a CVSS score of 7.4 (HIGH). Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.

How severe is CVE-2026-42893?

CVE-2026-42893 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42893?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Outlook.