#VU121282 Untrusted Pointer Dereference in Microsoft products - CVE-2026-20955

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Main Vulnerability Database Vulnerabilities #VU121282

#VU121282 Untrusted Pointer Dereference in Microsoft products - CVE-2026-20955

Published: January 13, 2026


Vulnerability identifier: #VU121282
Vulnerability risk: High
CVSSv4.0: 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/E:U/U:Amber
CVE-ID: CVE-2026-20955
CWE-ID: CWE-822
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Office Online Server
Microsoft Office
Microsoft 365 Apps for Enterprise
Microsoft Office LTSC
Software vendor:
Microsoft

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to untrusted pointer dereference in Microsoft Excel. A remote attacker can trick a victim to open a specially crafted file and execute arbitrary code on the system.


Remediation

Install updates from vendor's website.

External links