CVE-2024-30040Known exploitationNetwork attack vector

User-context code execution via OLE protection bypass

Published May 14, 2024 · Updated Oct 21, 2025

A security feature bypass in Windows MSHTML allows remote attackers to execute code by convincing a user to open a malicious file. MSHTML improperly validates crafted document content, allowing it to evade the COM/OLE control protections enforced by Microsoft 365 and Office. Opening the file is required, and resulting code runs in the signed-in user's context.

CVSS severity8.8
High
EPSS probability3.94%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A security feature bypass in Windows MSHTML allows remote attackers to execute code by convincing a user to open a malicious file. MSHTML improperly validates crafted document content, allowing it to evade the COM/OLE control protections enforced by Microsoft 365 and Office. Opening the file is required, and resulting code runs in the signed-in user's context.

The record

CVE
CVE-2024-30040
Published
May 14, 2024
Updated
Oct 21, 2025
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-20, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.10240.0 <10.0.10240.20651

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.20651
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.5820
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.6981
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.2960
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.4412
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.887
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.6981
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.3593
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.4412
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.5820
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.3593
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.3593
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.6981
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.2461
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.5820; version=10.0.17763.0 <10.0.17763.5820

Published CVSS scores

8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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