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High 8.8Known exploited (CISA KEV)Published Feb 10, 2026
CVE-2026-21510Windows Shell Security Feature Bypass Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft Windows 10 Version 1607 and 15 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Feb 10, 2026; federal agencies had to remediate by Mar 3, 2026. Treat that date as your deadline.
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Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
- CVSS
- 8.8 HIGH (v3.1, CNA)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
- Weakness (CWE)
- CWE-693
- Known exploited
- Added to CISA KEV Feb 10, 2026; federal remediation due Mar 3, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 24.54% (percentile 98)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Windows 10 Version 1607 microsoft:windows_10_1607 | from 10.0.14393.0 before 10.0.14393.8868 | CNA record |
Microsoft Windows 10 Version 1809 microsoft:windows_10_1809 | from 10.0.17763.0 before 10.0.17763.8389 | CNA record |
Microsoft Windows 10 Version 21H2 microsoft:windows_10_21h2 | from 10.0.19044.0 before 10.0.19044.6937 | CNA record |
Microsoft Windows 10 Version 22H2 microsoft:windows_10_22h2 | from 10.0.19045.0 before 10.0.19045.6937 | CNA record |
Microsoft Windows 11 version 22H3 microsoft:windows_11_22h3 | from 10.0.22631.0 before 10.0.22631.6649 | CNA record |
Microsoft Windows 11 Version 23H2 microsoft:windows_11_23h2 | from 10.0.22631.0 before 10.0.22631.6649 | CNA record |
Microsoft Windows 11 Version 24H2 microsoft:windows_11_24h2 | from 10.0.26100.0 before 10.0.26100.7840 | CNA record |
Microsoft Windows 11 Version 25H2 microsoft:windows_11_25h2 | from 10.0.26200.0 before 10.0.26200.7840 | CNA record |
Microsoft Windows 11 version 26H1 microsoft:windows_11_26h1 | from 10.0.28000.0 before 10.0.28000.1575 | CNA record |
Microsoft Windows Server 2012 microsoft:windows_server_2012 (from the name) | from 6.2.9200.0 before 6.2.9200.25923 | CNA record |
Microsoft Windows Server 2012 R2 microsoft:windows_server_2012_r2 (from the name) | from 6.3.9600.0 before 6.3.9600.23022 | CNA record |
Microsoft Windows Server 2016 microsoft:windows_server_2016 (from the name) | from 10.0.14393.0 before 10.0.14393.8868 | CNA record |
Microsoft Windows Server 2019 microsoft:windows_server_2019 (from the name) | from 10.0.17763.0 before 10.0.17763.8389 | CNA record |
Microsoft Windows Server 2022 microsoft:windows_server_2022 (from the name) | from 10.0.20348.0 before 10.0.20348.4773 | CNA record |
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) microsoft:windows_server_2022_23h2 | from 10.0.25398.0 before 10.0.25398.2149 | CNA record |
Microsoft Windows Server 2025 microsoft:windows_server_2025 (from the name) | from 10.0.26100.0 before 10.0.26100.32370 | CNA record |
microsoft windows_10_1607 microsoft:windows_10_1607 | before 10.0.14393.8868; before 10.0.14393.8868 | NVD |
microsoft windows_10_1809 microsoft:windows_10_1809 | before 10.0.17763.8389; before 10.0.17763.8389 | NVD |
microsoft windows_10_21h2 microsoft:windows_10_21h2 | before 10.0.19044.6937; before 10.0.19044.6937; before 10.0.19044.6937 | NVD |
microsoft windows_10_22h2 microsoft:windows_10_22h2 | before 10.0.19045.6937; before 10.0.19045.6937; before 10.0.19045.6937 | NVD |
microsoft windows_11_23h2 microsoft:windows_11_23h2 | before 10.0.22631.6649; before 10.0.22631.6649 | NVD |
microsoft windows_11_24h2 microsoft:windows_11_24h2 | before 10.0.26100.7781; before 10.0.26100.7781 | NVD |
microsoft windows_11_25h2 microsoft:windows_11_25h2 | before 10.0.26200.7781; before 10.0.26200.7781 | NVD |
microsoft windows_server_2012 microsoft:windows_server_2012 | all versions; r2 | NVD |
microsoft windows_server_2016 microsoft:windows_server_2016 | before 10.0.14393.8868 | NVD |
microsoft windows_server_2019 microsoft:windows_server_2019 | before 10.0.17763.8389 | NVD |
microsoft windows_server_2022 microsoft:windows_server_2022 | before 10.0.20348.4711 | NVD |
microsoft windows_server_2022_23h2 microsoft:windows_server_2022_23h2 | before 10.0.25398.2149 | NVD |
microsoft windows_server_2025 microsoft:windows_server_2025 | before 10.0.26100.32313 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510vendor-advisory, patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21510us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.