PT-2026-2749 · Microsoft · Office Excel

Published 2026-01-13 · Updated 2026-01-13 · CVE-2026-20949

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Microsoft Office Excel (affected versions not specified)

Description An improper access control issue exists in Microsoft Office Excel. This allows an unauthorized attacker to bypass a security feature locally.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

BDU:2026-00635

CVE-2026-20949

Affected Products

Office Excel

References · 5

• https://osv.dev/vulnerability/CVE-2026-20949 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20949 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00635 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-20949 · Security Note
• https://twitter.com/CVEnew/status/2011142889909178440 · Twitter Post