Medium [CVE-2026-45585] Windows BitLocker Security Feature Bypass Vulnerability
This medium-severity Microsoft Server advisory covers CVE-2026-45585 affecting Windows Server 2025 (Server Core installation).
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Summary
Microsoft is aware of a security feature bypass vulnerability in Windows publicly referred to as "YellowKey". The proof of concept for this vulnerability has been made public violating coordinated vulnerability best practices.
We are issuing this CVE to provide mitigation guidance that can be implemented to protect against this vulnerability until the security update is made available. Mitigation FAQs
Should I leverage the temporary mitigation? Microsoft recommends that you consider implementing these mitigations if you are concerned your devices and data are at risk of being compromised or stolen.
For example, if your organization’s employees take their work devices home or on business travel. What impact to service availability/management could be caused by implementing the mitigations?
Implementing these mitigations will not impact service availability or management operations. Do customers need to revert the changes made to mitigate the vulnerability once the security update to protect against this vulnerability is available?
No. The security update will maintain the mitigation's behavior once the security update is installed.
I am using TPM+PIN, am I at risk of this vulnerability being exploited No, if you are using TPM+PIN the vulnerability is not exploitable.
Affected product named by the advisory: Windows Server 2025 (Server Core installation).
- Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.8655
- Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.8655
- Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2269
- Windows Server 2025 10.0.26100.0 before 10.0.26100.32995
- Windows Server 2025 (Server Core installation) 10.0.26100.0 before 10.0.26100.32995
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 10.0.26100.8655
- 10.0.26200.8655
- 10.0.28000.2269
- 10.0.26100.32995
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- We are issuing this CVE to provide mitigation guidance that can be implemented to protect against this vulnerability until the security update is made available.
- Do customers need to revert the changes made to mitigate the vulnerability once the security update to protect against this vulnerability is available?
- The security update will maintain the mitigation's behavior once the security update is installed.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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