CVE-2026-45585 — MEDIUM (6.8)

Vulnerability 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.

CVSS Score

6.8

MEDIUM

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

PHYSICAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Microsoft	Windows 11 24H2	All versions
Microsoft	Windows 11 25H2	All versions
Microsoft	Windows 11 26H1	All versions
Microsoft	Windows Server 2025	All versions

Related Weaknesses (CWE)

CWE-77

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585Vendor AdvisoryMitigation
https://github.com/Nightmare-Eclipse/YellowKeyExploitThird Party Advisory

FAQ

What is CVE-2026-45585?

CVE-2026-45585 is a vulnerability with a CVSS score of 6.8 (MEDIUM). 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 coord...

How severe is CVE-2026-45585?

CVE-2026-45585 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-45585?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 24H2, Microsoft Windows 11 25H2, Microsoft Windows 11 26H1, Microsoft Windows Server 2025.