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Windows BitLocker Security Feature Bypass Vulnerability

Assessment

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 tra…

Severity
Important
CVSS base score
6.8CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C
Impact
Security Feature Bypass
EPSS, next 30 days
0.5%Higher than 39.8% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Exploitation More Likely
Publicly disclosed
Yes
Customer action
Required: apply the update
Component
Windows BitLocker
Weakness
CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Issued by
Microsoft
Published
19 May 2026 · May 2026
Last revised
9 Jun 2026Added links to June 2026 Windows security updates. Microsoft recommends installing this updates as soon as possible.

Updates that fix it

3 KBs
KBTypeRestartApplies toOther CVEs
KB5094125 Security Update Required Windows Server 2025, Windows Server 2025 (Server Core installation) All CVEs in KB5094125
KB5094126 Security Update Required Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for x64-based Systems All CVEs in KB5094126
KB5095051 Security Update Required Windows 11 version 26H1 for x64-based Systems All CVEs in KB5095051

Affected products

Windows
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