Use-after-free in Microsoft products - CVE-2026-20953
Published: January 14, 2026
Vulnerability identifier: #VU121456
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20953
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Microsoft Office. A remote attacker can run a specially crafted application and execute arbitrary code on the target system.
Affected software
Microsoft 365 Apps for Enterprise
Microsoft Office
Microsoft Office LTSC
Microsoft Office
Microsoft Office LTSC
How to mitigate CVE-2026-20953
Install updates from vendor's website.