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Description

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

PUBLISHED Reserved 2026-04-13 | Published 2026-05-12 | Updated 2026-05-20 | Assigner microsoft




HIGH: 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-284: Improper Access Control

Product status

16.0.1 (custom) before https://aka.ms/OfficeSecurityReleases
affected

19.0.0 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.1 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.0 (custom) before https://aka.ms/OfficeSecurityReleases
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40420 (Microsoft Office Click-To-Run Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-40420)

nvd.nist.gov (CVE-2026-40420)

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