CVE-2026-20956

HIGH

Microsoft Office Excel - Code Injection

Title source: llm

Description

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

References (1)

[Vendor Advisory] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20956

Scores

CVSS v3 7.8

EPSS 0.0006

EPSS Percentile 19.2%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Classification

CWE

CWE-822

Status published

Affected Products (8)

microsoft/365_apps

microsoft/365_apps

microsoft/office_long_term_servicing_channel

microsoft/office_long_term_servicing_channel

microsoft/office_long_term_servicing_channel

microsoft/office_long_term_servicing_channel

microsoft/office_long_term_servicing_channel

microsoft/office_long_term_servicing_channel

Timeline

Published Jan 13, 2026

Tracked Since Feb 18, 2026