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CVE-2026-45585

Windows BitLocker Security Feature Bypass Vulnerability

MEDIUM
6.8
CVSS Score
Published: May 19, 2026 at 11:30 PM UTC
Updated: August 10, 2026 at 03:40 PM UTC
4 products affected across 1 vendorWindows Server 2025Windows 11 24H2Windows 11 25H2

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Severity
MEDIUM6.8
Exploit prediction
EPSS 2%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 11 24H2· Microsoft
95%
10.0.26100.0 ≤ v < 10.0.26100.865510.0.26100.0
Affected range stops below 10.0.26100.8655, so it looks safe — our inference, not a vendor statement
Windows 11 25H2· Microsoft
95%
10.0.26200.0 ≤ v < 10.0.26200.865510.0.26200.0
Affected range stops below 10.0.26200.8655, so it looks safe — our inference, not a vendor statement
Windows 11 26H1· Microsoft
95%
10.0.28000.0 ≤ v < 10.0.28000.226910.0.28000.0
Affected range stops below 10.0.28000.2269, so it looks safe — our inference, not a vendor statement
Windows Server 2025· Microsoft
95%
10.0.26100.0 ≤ v < 10.0.26100.3299510.0.26100.0
Affected range stops below 10.0.26100.32995, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryPatchMitigation
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585
ExploitThird Party Advisory
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://github.com/Nightmare-Eclipse/YellowKey

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.8MEDIUMmicrosoft
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-77

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