CVE-2026-21513 (GCVE-0-2026-21513)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-05-11 21:25
VLAI CISA KEVIntel
Title
MSHTML Framework Security Feature Bypass Vulnerability
Summary
Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
Severity
8.8 (High)
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
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-693 - Protection Mechanism Failure
Assigner
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1607 Affected: 10.0.14393.0 , < 10.0.14393.8868 (custom)
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Microsoft Windows 10 Version 1809 Affected: 10.0.17763.0 , < 10.0.17763.8389 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 21H2 Affected: 10.0.19044.0 , < 10.0.19044.6937 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 22H2 Affected: 10.0.19045.0 , < 10.0.19045.6937 (custom)
Create a notification for this product.
Microsoft Windows 11 version 22H3 Affected: 10.0.22631.0 , < 10.0.22631.6649 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 23H2 Affected: 10.0.22631.0 , < 10.0.22631.6649 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 24H2 Affected: 10.0.26100.0 , < 10.0.26100.7840 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 25H2 Affected: 10.0.26200.0 , < 10.0.26200.7840 (custom)
Create a notification for this product.
Microsoft Windows 11 version 26H1 Affected: 10.0.28000.0 , < 10.0.28000.1575 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 26H1 Affected: 10.0.28000.0 , < 10.0.28000.1575 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 Affected: 6.2.9200.0 , < 6.2.9200.25923 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 (Server Core installation) Affected: 6.2.9200.0 , < 6.2.9200.25923 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 R2 Affected: 6.3.9600.0 , < 6.3.9600.23022 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 R2 (Server Core installation) Affected: 6.3.9600.0 , < 6.3.9600.23022 (custom)
Create a notification for this product.
Microsoft Windows Server 2016 Affected: 10.0.14393.0 , < 10.0.14393.8868 (custom)
Create a notification for this product.
Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.14393.0 , < 10.0.14393.8868 (custom)
Create a notification for this product.
Microsoft Windows Server 2019 Affected: 10.0.17763.0 , < 10.0.17763.8389 (custom)
Create a notification for this product.
Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.17763.0 , < 10.0.17763.8389 (custom)
Create a notification for this product.
Microsoft Windows Server 2022 Affected: 10.0.20348.0 , < 10.0.20348.4773 (custom)
Create a notification for this product.
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) Affected: 10.0.25398.0 , < 10.0.25398.2149 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 Affected: 10.0.26100.0 , < 10.0.26100.32370 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 (Server Core installation) Affected: 10.0.26100.0 , < 10.0.26100.32370 (custom)
Create a notification for this product.
Date Public
2026-02-10 16:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8c8230ba-f224-4ce7-bf59-fae3c05a0ef6

Vulnerability ID: CVE-2026-21513

Status: Confirmed

Status Updated: 2026-02-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-02-10
Asserted: 2026-02-10
Scope
Notes: KEV entry: Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability | Affected: Microsoft / Windows | Description: Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network. | 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. | Due date: 2026-03-03 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-21513 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21513
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-693
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2026-03-03
Date Added 2026-02-10
Vendorproject Microsoft
Vulnerabilityname Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-11 06:19 UTC | Updated: 2026-02-11 06:19 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 23d8a15a-c179-4a42-b121-1b8f9cddba30

Vulnerability ID: CVE-2026-21513

Status: Confirmed

Status Updated: 2026-06-01 10:50 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: MSHTML Framework Security Feature Bypass Vulnerability | Affected: Microsoft / Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation) | CVSS: 8.8 (HIGH) | EPSS: 0.15384 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title MSHTML Framework Security Feature Bypass Vulnerability
Vendor Microsoft
Product Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
Added Date 2026-06-01T10:50:47.633Z
Cvss Score 8.8
Epss Score 0.15384
Cvss Severity HIGH
Epss Percentile 0.96366
Used In Malware unknown
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-19 12:45 UTC | Updated: 2026-06-19 12:45 UTC
Show details on NVD website
To clipboard 

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\"cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2.9200.25923\", \"versionStartIncluding\": \"6.2.9200.0\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.3.9600.23022\", \"versionStartIncluding\": \"6.3.9600.0\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2.9200.25923\", \"versionStartIncluding\": \"6.2.9200.0\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.3.9600.23022\", \"versionStartIncluding\": \"6.3.9600.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-05-11T18:10:05.327Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21513\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T18:10:05.327Z\", \"dateReserved\": \"2025-12-30T18:10:54.845Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-02-10T17:51:26.733Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.