PT-2026-2754 · Microsoft · Office Excel

Minjea Park · Published 2026-01-13 · Updated 2026-01-13 · CVE-2026-20955

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 issue exists in Microsoft Office Excel where an untrusted pointer dereference can allow an unauthorized attacker to execute code locally.

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

Untrusted Pointer Dereference

Weakness Enumeration

CWE-822

Related Identifiers

BDU:2026-00390

CVE-2026-20955

Affected Products

Office Excel

References · 5

• https://bdu.fstec.ru/vul/2026-00390 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20955 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20955 · Security Note
• https://osv.dev/vulnerability/CVE-2026-20955 · Vendor Advisory
• https://twitter.com/CVEnew/status/2011181533609218165 · Twitter Post