CVE-2026-45585

CVE Enrichment

CVSS: 6.8 MEDIUM
EPSS: 0.49%
EPSS Percentile: 40.34%
CISA KEV: Not listed

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. 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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: secure@microsoft.com
Published: 20-May-2026 07:16
Last Modified: 24-Jul-2026 16:10
EPSS Date: 2026-10-10
CWE: CWE-77

CVSS Vector


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

Affected Products / Versions

microsoft / windows_11_24h2
Version / affected range: *
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
microsoft / windows_11_25h2
Version / affected range: *
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
microsoft / windows_11_26h1
Version / affected range: *
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
microsoft / windows_server_2025
Version / affected range: *
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

References

Last enrichment sync: 11-Oct-2026 16:57
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

YellowKey, tracked as CVE-2026-45585 (CVSS 6.8) is a publicly disclosed Windows zero-day vulnerability that bypasses BitLocker drive encryption by abusing behavior in the Windows Recovery Environment (WinRE). Three Windows Zero-Days Target BitLocker and Enable SYSTEM Privilege Escalation

CVE (1)

People (3)

MITRE ATT&CK (2)

Vendors (1)

Products (9)

Tools (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.