CVE-2026-65807CWE-843

CVE-2026-65807

High · published August 11, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
56.8
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00819 · 56.8th percentile
Weakness
CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')
Published
2026-08-11T21:19Z
Affected products (13)
ProductVersionsFixed in
microsoft/365_appsall versions—
microsoft/365_appsall versions—
microsoft/excelall versions—
microsoft/excelall versions—
microsoft/microsoft_365all versions—
microsoft/office_2019all versions—
microsoft/office_2019all versions—
microsoft/office_2021all versions—
microsoft/office_2021all versions—
microsoft/office_2021all versions—
microsoft/office_2024all versions—
microsoft/office_2024all versions—
microsoft/office_2024all versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65807 · [email protected]
EPSS history
Timeline
  • 11 AUG 17:05Z
    Microsoft Excel Remote Code Execution Vulnerability
    cvelistv5