PT-2026-40194 · Microsoft · Office Excel

Published 2026-05-12 · Updated 2026-05-19 · CVE-2026-40359

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 use after free issue in Microsoft Office Excel allows an unauthorized attacker to execute code locally. Use after free is a memory corruption flaw that occurs when an application continues to use a pointer after it has been freed, which can be exploited to alter the execution flow of the program.

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

RCE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-06768

CVE-2026-40359

Affected Products

Office Excel

References · 6

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40359 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-40359 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40359 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06768 · Security Note
• https://twitter.com/windowsforum/status/2054314826059464940 · Twitter Post
• https://t.me/cveNotify/164064 · Telegram Post