CVE-2026-21513

Description

Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.

Overview

State: PUBLISHED
Assigner (CNA): microsoft
CVSS severity: HIGH
CVSS score: 8.8 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Effective score: 8.8 / 10 HIGH source: CNA overview
MSRC score: 8.8 / 10 HIGH MS rating: Important · Security Feature Bypass
CWE(s): CWE-693
Reserved: 2025-12-30
Published: 2026-02-10 08:00 UTC
Last updated: 2026-02-10 08:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21513.json
Linked Threat: CVE-2026-21513 — Microsoft Windows: Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Vendor / project: Microsoft
Product: Windows
Date added to KEV: 2026-02-10
Remediation due: 2026-03-03
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware campaign use: Unknown
CISA notes: https://msrc.microsoft.com/update-guide/advisory/CVE-2026-21513 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21513
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-02-10 18:16:33 UTC
NVD last modified: 2026-03-30 13:28:07 UTC
NVD CVSS v3.1: 8.8 / 10 HIGH source: secure@microsoft.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitability subscore: 2.8 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.2467 (probability of exploitation in next 30 days)
EPSS percentile: 96.21% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-7342
Assigner: microsoft
Published: Feb 10, 2026, 5:51:26 PM
Updated: May 11, 2026, 9:25:25 PM
EUVD base score (CVSS 3.1): 8.8 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EUVD-reported EPSS: 24.9600
Vendors: Microsoft
Products: Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.25923)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.8389)

Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows Server 2012 (6.2.9200.0 <6.2.9200.25923)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.23022)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows Server 2022, 23H2 Edition (Server Core installation) (10.0.25398.0 <10.0.25398.2149)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2012 (6.2.9200.0 <6.2.9200.25923)

Windows Server 2022, 23H2 Edition (Server Core installation) (10.0.25398.0 <10.0.25398.2149)

Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.8868)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.8389)

Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows Server 2025 (Server Core installation) (10.0.26100.0 <10.0.26100.32370)

Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.25923)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.23022)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.23022)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.8868)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.23022)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows Server 2025 (Server Core installation) (10.0.26100.0 <10.0.26100.32370)
Aliases: GHSA-rqf6-jf48-p6rm

ENISA description: Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.

EUVD references (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-07-15 03:05 UTC (source: CVRF).

MS severity: Important
Impact: Security Feature Bypass
MS CVSS base score: 8.8 / 10 (temporal 7.7)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Exploit assessment: Publicly Disclosed:Yes;Exploited:Yes;Latest Software Release:Exploitation Detected
Release: 2026-Feb

Microsoft remediations / KB articles (28)

5077179 — Vendor Fix / Security Update (fixed build 10.0.28000.1575)
https://support.microsoft.com/help/5077179 — None Available / 5077179
5075904 — Vendor Fix / Security Update (fixed build 10.0.17763.8389)
https://support.microsoft.com/help/5075904 — None Available / 5075904
5075906 — Vendor Fix / Security Update (fixed build 10.0.20348.4773)
https://support.microsoft.com/help/5075906 — None Available / 5075906
5075943 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.20348.4711)
https://support.microsoft.com/help/5075943 — None Available / 5075943
5075912 — Vendor Fix / Security Update (fixed build 10.0.19044.6937)
https://support.microsoft.com/help/5075912 — None Available / 5075912
5075899 — Vendor Fix / Security Update (fixed build 10.0.26100.32370)
https://support.microsoft.com/help/5075899 — None Available / 5075899
5075942 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.26100.32313)
https://support.microsoft.com/help/5075942 — None Available / 5075942
5077181 — Vendor Fix / Security Update (fixed build 10.0.26200.7840)
https://support.microsoft.com/help/5077181 — None Available / 5077181
5077212 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.26200.7781)
https://support.microsoft.com/help/5077212 — None Available / 5077212
5075941 — Vendor Fix / Security Update (fixed build 10.0.22631.6649)
https://support.microsoft.com/help/5075941 — None Available / 5075941
5075897 — Vendor Fix / Security Update (fixed build 10.0.25398.2149)
https://support.microsoft.com/help/5075897 — None Available / 5075897
5075999 — Vendor Fix / Security Update (fixed build 10.0.14393.8868)
https://support.microsoft.com/help/5075999 — None Available / 5075999
5075971 — Vendor Fix / Monthly Rollup (fixed build 6.2.9200.25923)
https://support.microsoft.com/help/5075971 — None Available / 5075971
5075970 — Vendor Fix / Monthly Rollup (fixed build 6.3.9600.23022)
https://support.microsoft.com/help/5075970 — None Available / 5075970

Microsoft FAQ (2)

According to the CVSS metric, the attack vector is user interaction is required (UI:R). How could an attacker exploit this security feature bypass vulnerability?

An attacker could exploit this vulnerability by convincing a user to open a malicious HTML file or shortcut (.lnk) file delivered through a link, email attachment, or download. The specially crafted file manipulates browser and Windows Shell handling, causing the content to be executed by the operating system. This allows the attacker to bypass security features and potentially achieve code execution.

What kind of security feature could be bypassed by successfully exploiting this vulnerability?

This update address a vulnerability that bypasses prompts when executing a file.

Affected products (22)

Vendor	Product	Versions	Platforms
Microsoft	Windows 10 Version 1607	`10.0.14393.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 1809	`10.0.17763.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 21H2	`10.0.19044.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 10 Version 22H2	`10.0.19045.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 version 22H3	`10.0.22631.0` (affected)	ARM64-based Systems
Microsoft	Windows 11 Version 23H2	`10.0.22631.0` (affected)	x64-based Systems
Microsoft	Windows 11 Version 24H2	`10.0.26100.0` (affected)	ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 Version 25H2	`10.0.26200.0` (affected)	—
Microsoft	Windows 11 version 26H1	`10.0.28000.0` (affected)	ARM64-based Systems
Microsoft	Windows 11 Version 26H1	`10.0.28000.0` (affected)	—
Microsoft	Windows Server 2012	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 (Server Core installation)	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2	`6.3.9600.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2 (Server Core installation)	`6.3.9600.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016 (Server Core installation)	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019 (Server Core installation)	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022	`10.0.20348.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	`10.0.25398.0` (affected)	x64-based Systems
Microsoft	Windows Server 2025	`10.0.26100.0` (affected)	x64-based Systems
Microsoft	Windows Server 2025 (Server Core installation)	`10.0.26100.0` (affected)	x64-based Systems

Affected products — CPE 2.3 (23) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:-:*:x64:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:-:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:-:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:-:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

MSHTML Framework Security Feature Bypass Vulnerability vendor-advisorypatch

Web references (29)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513 secure@microsoft.com Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21513 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource
https://www.vicarius.io/vsociety/posts/cve-2026-21513-detection-script-security-feature-bypass-vulnerability-in-mshtml-framework af854a3a-2127-422b-91ae-364da2661108 Third Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2026-21513-mitigation-script-security-feature-bypass-vulnerability-in-mshtml-framework af854a3a-2127-422b-91ae-364da2661108 MitigationThird Party Advisory

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cwe	`CWE-693`	no local data	2026-05-14 02:58 UTC
cve	`CVE-2026-21513`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

February 2026 Microsoft Patch Tuesday | Tenable®

web:www.tenable.com

Microsoft patched six zero-day vulnerabilities that were exploited in the wild including CVE - 2026 -21510 and CVE-2026-21513 .

2026-05-14 16:50 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-05-14 16:50 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-05-14 16:50 UTC
Nvd - Cve-2026-21513

web:nvd.nist.gov

Official websites use .gov A .gov website belongs to an official government organization in the United States.

2026-05-14 16:50 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-14 16:50 UTC
CVE-2026-21513 - Vulnerability Details - OpenCVE

web:app.opencve.io

Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Apply the Microsoft update that fixes CVE‑2026‑21513 via Windows Update or the Microsoft Update Catalog.

2026-05-14 16:50 UTC
CVE Record: CVE-2026-21513

web:www.cve.org

Description Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.

2026-05-14 16:50 UTC
CVE-2026-21513: Windows 10 1607 Auth Bypass Vulnerability - SentinelOne

web:www.sentinelone.com

CVE-2026-21513 is an authentication bypass vulnerability in Microsoft Windows 10 1607. Learn about its impact, affected versions, and mitigation methods.

2026-05-14 16:50 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-03-03 Known ransomware campaign use: Unknown

2026-05-14 01:13 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-21513.json.

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