# Microsoft MSHTML vulnerabilities

Source: https://junglewise.ai/threats/technologies/mshtml  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/mshtml.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Microsoft MSHTML: 0 in the last 7 days and 0 in the last 90 days, 3 of them critical and 3 exploited in the wild. The most recent, CVE-2026-21513, was published on 10 February 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 3 (3 critical, 3 exploited in the wild)

## About Microsoft MSHTML

Microsoft HTML and scripting engine component used by Internet Explorer and other Windows applications.

## Latest Microsoft MSHTML vulnerabilities

- [CVE-2026-21513: Microsoft MSHTML Framework protection mechanism failure](https://junglewise.ai/threats/cve-2026-21513-microsoft-mshtml-framework-protection-mechanism-failure) (critical, exploited in the wild, CVSS 8.8, published 10 Feb 2026)
- [CVE-2021-40444: Microsoft MSHTML Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2021-40444-microsoft-mshtml-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 8.8, published 3 Nov 2021)
- [CVE-2019-0541: Microsoft MSHTML Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2019-0541-microsoft-mshtml-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 8.8, published 3 Nov 2021)

## Most severe Microsoft MSHTML vulnerabilities

- [CVE-2026-21513: Microsoft MSHTML Framework protection mechanism failure](https://junglewise.ai/threats/cve-2026-21513-microsoft-mshtml-framework-protection-mechanism-failure) (critical, exploited in the wild, CVSS 8.8, published 10 Feb 2026)
- [CVE-2021-40444: Microsoft MSHTML Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2021-40444-microsoft-mshtml-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 8.8, published 3 Nov 2021)
- [CVE-2019-0541: Microsoft MSHTML Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2019-0541-microsoft-mshtml-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 8.8, published 3 Nov 2021)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Microsoft technologies

- [Microsoft Windows](https://junglewise.ai/threats/technologies/windows): 2,362 vulnerabilities
- [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10): 589 vulnerabilities
- [Microsoft Windows 11 24h2](https://junglewise.ai/threats/technologies/windows-11-24h2): 565 vulnerabilities
- [Microsoft Windows 11 25h2](https://junglewise.ai/threats/technologies/windows-11-25h2): 534 vulnerabilities
- [Microsoft Windows Server 2025](https://junglewise.ai/threats/technologies/windows-server-2025): 534 vulnerabilities
- [Microsoft Windows Server 2022](https://junglewise.ai/threats/technologies/windows-server-2022): 528 vulnerabilities
- [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019): 521 vulnerabilities
- [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012): 517 vulnerabilities
- [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11): 494 vulnerabilities
- [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016): 476 vulnerabilities
- [Microsoft Windows 10 1809](https://junglewise.ai/threats/technologies/windows-10-1809): 380 vulnerabilities
- [Microsoft Windows 10 21h2](https://junglewise.ai/threats/technologies/windows-10-21h2): 373 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Microsoft MSHTML vulnerabilities", https://junglewise.ai/threats/technologies/mshtml, 11 November 2026.