CVE-2026-45585

Published May 20, 2026

Last updated 2 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.
Source: secure@microsoft.com
NVD status: Analyzed
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