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HIGH · 8.8

CVE-2026-65807

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

Vulnerability Description

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

CVSS Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
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-

Related Weaknesses (CWE)

CWE-843

References

FAQ

What is CVE-2026-65807?

CVE-2026-65807 is a vulnerability with a CVSS score of 8.8 (HIGH). Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

How severe is CVE-2026-65807?

CVE-2026-65807 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-65807?

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.