Code Injection in Microsoft Office for macOS and Microsoft Office - CVE-2026-123395
Published: November 11, 2026
Vulnerability identifier: #VU165488
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-123395
CWE-ID: CWE-94
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose file content accessible to the compromised user.
The vulnerability exists due to improper control of code generation in Microsoft Office Excel when its Data Streamer add-in connects to a local application. A local user can run a malicious application locally and convince a user to connect the add-in to that application to disclose file content.
The scope of accessible file content depends on the privileges of the compromised user.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-123395
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.115.26110837
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140