CVE-2026-40367
Microsoft Word Remote Code Execution Vulnerability
HIGH
8.4
CVSS Score
Published: May 12, 2026 at 04:59 PM UTC
Updated: June 17, 2026 at 10:45 AM UTC
11 products affected across 1 vendorOffice365 AppsOffice 2021
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Severity
HIGH8.4
Exploit prediction
EPSS 0.5%
SSVC
No known exploit
Description
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
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
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
Affected range stops below 16.109.26051019, so it looks safe — our inference, not a vendor statement
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.109.26051019, so it looks safe — our inference, not a vendor statement
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.19725.20280, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.5552.1000, so it looks safe — our inference, not a vendor statement
16.0.0 ≤ v < 16.0.5552.100216.0.0
Affected range stops below 16.0.5552.1002, so it looks safe — our inference, not a vendor statement
16.0.0 ≤ v < 16.0.10417.2012816.0.0
Affected range stops below 16.0.10417.20128, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo 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-2026-40367SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
8.4HIGHmicrosoft
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-822
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