CVE-2026-66809CWE-125

CVE-2026-66809

Medium · published August 11, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
36.7
In the wild
Unconfirmed
What it is

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00435 · 36.7th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-08-11T21:19Z
Affected products (13)
ProductVersionsFixed in
microsoft/365_appsall versions—
microsoft/365_appsall 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—
microsoft/wordall versions—
microsoft/wordall versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66809 · [email protected]
EPSS history
Timeline
  • 11 AUG 17:07Z
    Microsoft Office Graphics Component Information Disclosure Vulnerability
    cvelistv5