Description
Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.
Affected products
microsoft: 365 apps; microsoft: office 2016; microsoft: office 2019; microsoft: office 2021; microsoft: office 2024
References1
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64918 PatchVendor Advisory
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 1% percentile: 59 · as of 3 November 2026
- CWE
- CWE-522
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.