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CVE-2026-40418

Microsoft Office Click-To-Run Elevation of Privilege Vulnerability

HIGH
7.8
CVSS Score
Published: May 12, 2026 at 04:59 PM UTC
Updated: October 26, 2026 at 06:10 PM UTC
6 products affected across 1 vendorOffice365 AppsOffice Long Term Servicing Channel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Use after free in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

365 Apps· Microsoft
95%
All versions16.0.1
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office· Microsoft
95%
2019
Office Long Term Servicing Channel· Microsoft
95%
20212024
Office 2019· Microsoft
90%
19.0.0 ≤ v < https://aka.ms/OfficeSecurityReleases19.0.0
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office 2021· Microsoft
90%
16.0.1 ≤ v < https://aka.ms/OfficeSecurityReleases16.0.1
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office 2024· Microsoft
90%
16.0.0 ≤ v < https://aka.ms/OfficeSecurityReleases16.0.0
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40418

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

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