Out-of-bounds read in Microsoft 365 Apps for Enterprise and Microsoft Office LTSC - CVE-2026-20944
Published: January 14, 2026
Vulnerability identifier: #VU121458
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-2026-20944
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in Microsoft Word. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger an out-of-bounds read error and read contents of memory on the system, leading to arbitrary code execution.
Affected software
Microsoft 365 Apps for Enterprise
Microsoft Office LTSC
Microsoft Office LTSC
How to mitigate CVE-2026-20944
Install updates from vendor's website.