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HIGH · 7.8

CVE-2026-44817

Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Vulnerability Description

Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS Score

7.8

HIGH

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

Affected Products

VendorProductVersions
Microsoft365 Apps-
MicrosoftExcel2016
MicrosoftMicrosoft 365-
MicrosoftOffice 2019-
MicrosoftOffice 2021-
MicrosoftOffice 2024-
MicrosoftOffice Online Server-

Related Weaknesses (CWE)

CWE-843

References

FAQ

What is CVE-2026-44817?

CVE-2026-44817 is a vulnerability with a CVSS score of 7.8 (HIGH). Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

How severe is CVE-2026-44817?

CVE-2026-44817 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-44817?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft 365 Apps, Microsoft Excel, Microsoft Microsoft 365, Microsoft Office 2019, Microsoft Office 2021.