CVE-2026-45585

medium

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.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585

https://www.bleepingcomputer.com/news/microsoft/microsoft-shares-mitigation-for-yellowkey-windows-zero-day/

https://securityaffairs.com/192325/hacking/chaotic-eclipse-discloses-miniplasma-zero-day-suggesting-a-missing-or-undone-2020-windows-security-fix.html

https://securityaffairs.com/192173/hacking/researchers-uncover-yellowkey-and-greenplasma-windows-zero-days.html

https://arstechnica.com/security/2026/05/zero-day-exploit-completely-defeats-default-windows-11-bitlocker-protections/

https://www.bleepingcomputer.com/news/security/windows-bitlocker-zero-day-gives-access-to-protected-drives-poc-released/

https://github.com/Nightmare-Eclipse/YellowKey

Details

Source: Mitre, NVD

Published: 2026-05-20

Updated: 2026-05-20

Named Vulnerability: YellowKey

Risk Information

CVSS v2

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 6.8

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

Severity: Medium

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability Being Monitored

Detections

Analytics