CVE-2026-45585

Published May 20, 2026

Last updated 3 days ago

CVSS medium 6.8

Overview

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.
Source: secure@microsoft.com
NVD status: Modified
Products: windows_11_24h2, windows_11_25h2, windows_11_26h1, windows_server_2025

Risk scores

CVSS 3.1

Type: Secondary
Base score: 6.8
Impact score: 5.9
Exploitability score: 0.9
Vector string: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: MEDIUM

Weaknesses

secure@microsoft.com: CWE-77

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*",
            "matchCriteriaId": "1799DC19-34BA-42B4-A6DC-02774202DE22",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*",
            "matchCriteriaId": "AAAB3FDE-4FF2-47DE-9BDA-25B2855054E7",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*",
            "matchCriteriaId": "DA9F6F61-46D3-4ECD-8B5D-1484222B7364",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "9B12238F-DF99-4247-B645-259C3FD98F61",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.

Overview

Risk scores

CVSS 3.1

Weaknesses

Social media

Configurations

Related CVEs

References