CVE-2026-64918CWE-522

CVE-2026-64918

Medium · published September 8, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
58.5
In the wild
Unconfirmed
What it is

Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00874 · 58.5th percentile
Weakness
CWE-522 · Insufficiently Protected Credentials
Published
2026-09-08T22:18Z
Affected products (10)
ProductVersionsFixed in
microsoft/365_appsall versions—
microsoft/365_appsall 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_2024all versions—
microsoft/office_2024all versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64918 · [email protected]
EPSS history
Timeline
  • 10 SEP 03:17Z
    EPSS moved — → 0%
    epss
  • 08 SEP 17:16Z
    Microsoft Office Spoofing Vulnerability
    cvelistv5