PT-2026-40193 · Microsoft · Office

Published 2026-05-12 · Updated 2026-05-19 · CVE-2026-40358

Positive Technologies (AI Summary)

CVSS v3.1

8.4

High

Base vector

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

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

Description A use after free issue in Microsoft Office 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:2026-06752

CVE-2026-40358

Affected Products

Office

References · 6

• https://bdu.fstec.ru/vul/2026-06752 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40358 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40358 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40358 · Security Note
• https://twitter.com/windowsforum/status/2054314064138883200 · Twitter Post
• https://t.me/cveNotify/164063 · Telegram Post