CVE-2026-21510

Description

Protection mechanism failure in Windows Shell 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:F/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-2026-21510.json
Linked Threat: CVE-2026-21510 — Microsoft Windows: Microsoft Windows Shell 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 Windows Shell 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/vulnerability/CVE-2026-21510 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21510
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: 2026-02-11 16:13:25 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: 0.0496 (probability of exploitation in next 30 days)
EPSS percentile: 89.78% 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-2026-7337
Assigner: microsoft
Published: Feb 10, 2026, 5:51:32 PM
Updated: May 11, 2026, 9:25:33 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:F/RL:O/RC:C
EUVD-reported EPSS: 4.9600
Vendors: Microsoft
Products: Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

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

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2012 (6.2.9200.0 <6.2.9200.25923)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

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

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.23022)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

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

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows Server 2019 (Server Core installation) (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 2025 (10.0.26100.0 <10.0.26100.32370)

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

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.23022)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

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 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

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

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

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

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

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

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

Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows Server 2012 (6.2.9200.0 <6.2.9200.25923)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)
Aliases: GHSA-q6v4-4w5r-j7hr

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

EUVD references (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510

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 8.2)
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
Exploit assessment: Publicly Disclosed:Yes;Exploited:Yes;Latest Software Release:Exploitation Detected
Release: 2026-Feb

Microsoft remediations / KB articles (28)

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
5077179 — Vendor Fix / Security Update (fixed build 10.0.28000.1575)
https://support.microsoft.com/help/5077179 — None Available / 5077179

Microsoft FAQ (2)

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?

To successfully exploit this vulnerability, an attacker must convince a user to open a malicious link or shortcut file.

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

An attacker could bypass Windows SmartScreen and Windows Shell security prompts by exploiting improper handling in Windows Shell components, allowing attacker‑controlled content to execute without user warning or consent.

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:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

Vendor references (1)

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

Windows Shell Security Feature Bypass Vulnerability vendor-advisorypatch

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Windows Shell Security Feature Bypass Vulnerability vendor-advisory, patch

Web references (28)

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 (2)

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-2026-21510 secure@microsoft.com Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21510 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource

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-2026-21510`	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

CVE-2026-21510 is a security feature bypass vulnerability affecting Windows Shell. It was assigned a CVSSv3 score of 8.8 and was rated as important. According to Microsoft, this flaw was publicly disclosed prior to a patch being made available and was also exploited in the wild as a zero-day. Exploitation requires an attacker to convince an unsuspecting user to open a malicious link or ...

2026-05-14 16:50 UTC
Nvd - Cve-2026-21510

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
Feb 2026: Windows Shell Security Feature Bypass Vulnerability

web:stack.watch

Known Exploited Vulnerability This Microsoft Windows Shell Protection Mechanism Failure Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Microsoft Windows Shell contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network. . The following remediation steps are recommended / required by March ...

2026-05-14 16:50 UTC
CVE-2026-21510 - Vulnerability Details - OpenCVE

web:app.opencve.io

Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Install the Windows update that addresses CVE‑2026‑21510 on all affected Windows 10, 11, and Server installations. Ensure all systems receive the latest cumulative update for the affected OS versions before the rollout completes.

2026-05-14 16:50 UTC
CISA Adds Six Known Exploited Vulnerabilities to Catalog

web:www.cisa.gov

CISA has added six new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-21510

2026-05-14 16:50 UTC
Microsoft fixes six zero-days on February 2026 Patch Tuesday

web:www.csoonline.com

Microsoft highlighted six new and actively exploited vulnerabilities among the 60 fixes issued in today's February Patch Tuesday releases.

2026-05-14 16:50 UTC
CVE Record: CVE-2026-21510

web:www.cve.org

Vulnerability detail for CVE-2026-21510 Notice: Expanded keyword searching of CVE Records (with limitations) is now available in the search box above. Learn more here.

2026-05-14 16:50 UTC
CVE-2026-21510: Windows 10 1607 Auth Bypass Vulnerability - SentinelOne

web:www.sentinelone.com

CVE-2026-21510 is an authentication bypass vulnerability in 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-2026-21510.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
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                "id": "CVE-2026-21510",
                "options": [
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                  },
                  {
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                  },
                  {
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                  }
                ],
                "role": "CISA Coordinator",
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        "providerMetadata": {
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        "title": "CISA ADP Vulnrichment"
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          "product": "Windows 11 Version 25H2",
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          "product": "Windows 11 version 26H1",
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          "product": "Windows Server 2012",
          "vendor": "Microsoft",
          "versions": [
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          "product": "Windows Server 2012 R2",
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