CVE-2026-20955

high Microsoft
CVSS v3 Base Score
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: January 13, 2026
Last Modified: January 14, 2026
Vendor: Microsoft

Description

Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CWE

CWE-822

Affected Products

microsoft 365 appsmicrosoft officemicrosoft office long term servicing channelmicrosoft office online server

References

🔗 msrc.microsoft.com