PT-2026-40230 · Microsoft · Office Click-To-Run

CVE-2026-40420 · Published 2026-05-12 · Updated 2026-05-12

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

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

Description Improper access control in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally to SYSTEM level.

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

BDU:2026-06750

CVE-2026-40420

Affected Products

Office Click-To-Run

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-40420 · Security Note
• https://bdu.fstec.ru/vul/2026-06750 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40420 · Vendor Advisory
• https://feedly.com/cve/CVE-2026-40420 · Note
• https://twitter.com/windowsforum/status/2054322416088719543 · Twitter Post