Vulnerability Report

CVE-2026-45585

RCE

Title: Windows Security Feature Bypass (YellowKey)

RCE

Proof Of Concept

PoC Available for CVE-2026-45585

CWE Category CWE-77

Published Date May 20, 2026

Modified Date May 22, 2026

Exploit Status Available

Score 6.8 CVSS v3.1

Exploit Probability (EPSS)

0.85%

Vulnerability Summary

CVE-2026-45585: 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.

Impacted Vendors

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.8

Attack Vector

PHYSICAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-45585 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/bjbakker1984/Yellowkey-mitigation

View Code

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Attack Vector Matrix

Access Vector PHYSICAL

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.