PT-2026-40201 · Microsoft · Office Word

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-40366

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 Word (affected versions not specified)

Description A use after free issue in Microsoft Office Word allows an unauthorized attacker to execute arbitrary code locally and remotely, affecting the system. Use after free is a memory corruption flaw that occurs when an application continues to use a pointer after it has been freed.

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:2026-06861

CVE-2026-40366

Affected Products

Office Word

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-40366 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40366 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40366 · Security Note
• https://bdu.fstec.ru/vul/2026-06861 · Security Note