CVE-2026-21265Windows Secure Boot stores Microsoft certificates in the UEFI KEK and DB.
Updated under an hour ago ()
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It affects microsoft windows_10_1607 and 12 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Windows Secure Boot stores Microsoft certificates in the UEFI KEK and DB. These original certificates are approaching expiration, and devices containing affected certificate versions must update them to maintain Secure Boot functionality and avoid compromising security by losing security fixes related to Windows boot manager or Secure Boot. The operating system’s certificate update protection mechanism relies on firmware components that might contain defects, which can cause certificate trust updates to fail or behave unpredictably. This leads to potential disruption of the Secure Boot trust chain and requires careful validation and deployment to restore intended security guarantees. Certificate Authority (CA) Location Purpose Expiration Date Microsoft Corporation KEK CA 2011 KEK Signs updates to the DB and DBX 06/24/2026 Microsoft Corporation UEFI CA 2011 DB Signs 3rd party boot loaders, Option ROMs, etc. 06/27/2026 Microsoft Windows Production PCA 2011 DB Signs the Windows Boot Manager 10/19/2026 For more information see this CVE and Windows Secure Boot certificate expiration and CA updates.
- CVSS
- 6.4 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-1329
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
microsoft windows_10_1607 microsoft:windows_10_1607 | before 10.0.14393.8783; before 10.0.14393.8783 | NVD |
microsoft windows_10_1809 microsoft:windows_10_1809 | before 10.0.17763.8276; before 10.0.17763.8276 | NVD |
microsoft windows_10_21h2 microsoft:windows_10_21h2 | before 10.0.19044.6809; before 10.0.19044.6809; before 10.0.19044.6809 | NVD |
microsoft windows_10_22h2 microsoft:windows_10_22h2 | before 10.0.19045.6809; before 10.0.19045.6809; before 10.0.19045.6809 | NVD |
microsoft windows_11_23h2 microsoft:windows_11_23h2 | before 10.0.22631.6491; before 10.0.22631.6491 | NVD |
microsoft windows_11_24h2 microsoft:windows_11_24h2 | before 10.0.26100.7623; before 10.0.26100.7623 | NVD |
microsoft windows_11_25h2 microsoft:windows_11_25h2 | before 10.0.26200.7623; before 10.0.26200.7623 | NVD |
microsoft windows_server_2012 microsoft:windows_server_2012 | all versions; r2 | NVD |
microsoft windows_server_2016 microsoft:windows_server_2016 | before 10.0.14393.8783 | NVD |
microsoft windows_server_2019 microsoft:windows_server_2019 | before 10.0.17763.8276 | NVD |
microsoft windows_server_2022 microsoft:windows_server_2022 | before 10.0.20348.4648 | NVD |
microsoft windows_server_2022_23h2 microsoft:windows_server_2022_23h2 | before 10.0.25398.2092 | NVD |
microsoft windows_server_2025 microsoft:windows_server_2025 | before 10.0.26100.32230 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21265vendor-advisory
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.