Security Vulnerabilities
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 Score
6.4
EPSS Score
0.003
Published
2026-01-13
Use of uninitialized resource in Dynamic Root of Trust for Measurement (DRTM) allows an authorized attacker to disclose information locally.
CVSS Score
4.4
EPSS Score
0.002
Published
2026-01-13
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
CVSS Score
8.8
EPSS Score
0.016
Published
2026-01-13
Improper verification of cryptographic signature in Windows Admin Center allows an authorized attacker to elevate privileges locally.
CVSS Score
7.5
EPSS Score
0.0
Published
2026-01-13
Use after free in Inbox COM Objects allows an unauthorized attacker to execute code locally.
CVSS Score
7.0
EPSS Score
0.001
Published
2026-01-13
Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.
CVSS Score
7.0
EPSS Score
0.0
Published
2026-01-13
Stack-based buffer overflow in Azure Connected Machine Agent allows an authorized attacker to elevate privileges locally.
CVSS Score
7.8
EPSS Score
0.001
Published
2026-01-13
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
CVSS Score
8.4
EPSS Score
0.0
Published
2026-01-13
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CVSS Score
7.8
EPSS Score
0.001
Published
2026-01-13
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CVSS Score
7.8
EPSS Score
0.001
Published
2026-01-13