Reliance on Untrusted Inputs in a Security Decision in Microsoft Office for macOS and Microsoft Office - CVE-2026-108433
Published: November 5, 2026
Vulnerability identifier: #VU159353
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-108433
CWE-ID: CWE-807
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass OLE security protections in Microsoft Office.
The vulnerability exists due to reliance on untrusted inputs in a security decision in Microsoft Office Word when processing a malicious Office file. A remote attacker can send a specially crafted Office file and convince a user to open it to bypass protections against vulnerable COM/OLE controls.
The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-108433
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.114 26101123
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056