CVE-2026-81391CWE-908

CVE-2026-81391

Medium · published September 8, 2026

CVSS v3.1
5.5
EPSS
1%
Percentile
44.7
In the wild
Unconfirmed
What it is

Use of uninitialized resource in Microsoft Office Excel 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
0.00541 · 44.7th percentile
Weakness
CWE-908 · Use of Uninitialized Resource
Published
2026-09-08T22:20Z
Affected products (15)
ProductVersionsFixed in
microsoft/365_appsall versions—
microsoft/365_appsall versions—
microsoft/excelall versions—
microsoft/excelall versions—
microsoft/microsoft_365all versions—
microsoft/office_2016all versions—
microsoft/office_2016all 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-2026-81391 · [email protected]
EPSS history
Timeline
  • 10 SEP 03:18Z
    EPSS moved — → 0%
    epss
  • 08 SEP 17:18Z
    Microsoft Excel Information Disclosure Vulnerability
    cvelistv5