PT-2026-58529 · Microsoft · Office Excel

Published 2026-07-14 · Updated 2026-07-15 · CVE-2026-55024

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 A type confusion issue occurs when a resource is accessed using an incompatible type. This flaw allows an unauthorized attacker to execute arbitrary code locally on the system by utilizing a malicious spreadsheet.

Recommendations Apply update KB5002886.

Fix

RCE

Type Confusion

Weakness Enumeration

CWE-843

Related Identifiers

CVE-2026-55024

Affected Products

Office Excel

References · 4

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-55024 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55024 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-55024 · Security Note
• https://twitter.com/windowsforum/status/2077408634271662141 · Twitter Post