CVE-2026-40363

EUVD-2026-29645
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
microsoftCNA
8.4 HIGH
LOCAL
LOW
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 32.6%
Affected Products (NVD)
VendorProductVersion
microsoft365_apps
-
microsoft365_apps
𝑥
< 2604
microsoftoffice
𝑥
< 2604
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
microsoftoffice_2016
16.0.0 ≤
𝑥
< 16.0.5552.1000
CNA
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363