Description
Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
patch
Microsoft Office Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45463
Scores
CVSS v3
8.4
EPSS
0.0036
EPSS Percentile
29.1%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-121
CWE-191
Status
published
Products (20)
microsoft/365_apps
(2 CPE variants)
microsoft/365_copilot
Microsoft/Microsoft 365 Apps for Enterprise
16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office 2016
16.0.0 - 16.0.5556.1005
Microsoft/Microsoft Office 2019
19.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office 365 for Mac
-
Microsoft/Microsoft Office 365 for Mac
1.0.0 - 16.110.26061317
Microsoft/Microsoft Office for Android
-
Microsoft/Microsoft Office for Android
16.0.1 - 16.0.20131.20024
Microsoft/Microsoft Office LTSC 2021
16.0.1 - https://aka.ms/OfficeSecurityReleases
... and 10 more
Published
Jun 09, 2026
Tracked Since
Jun 09, 2026