{"id":"CVE-2026-45585","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-45585","generatedAt":"2026-10-28T15:29:46.671Z","title":"Microsoft is aware of a security feature bypass vulnerability in Windows publicly referred to as "YellowKey".","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.\nWe are issuing this CVE to provide mitigation guidance that can be implemented to protect against this vulnerability until the security update is made available.\nMitigation FAQs\nShould I leverage the temporary mitigation?\nMicrosoft 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.\nWhat impact to service availability/management could be caused by implementing the mitigations?\nImplementing these mitigations will not impact service availability or management operations.\nDo customers need to revert the changes made to mitigate the vulnerability once the security update to protect against this vulnerability is available?\nNo. The security update will maintain the mitigation's behavior once the security update is installed.\nI am using TPM+PIN, am I at risk of this vulnerability being exploited\nNo, if you are using TPM+PIN the vulnerability is not exploitable.","published":"2026-05-20T00:16:44.000Z","lastModified":"2026-07-24T09:10:00.000Z","status":"Modified","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"3.1","score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-77"],"affected":["microsoft/windows 11 24h2","microsoft/windows 11 25h2","microsoft/windows 11 26h1","microsoft/windows server 2025"],"epss":{"score":0.01891,"percentile":0.79455,"date":"2026-10-27","history":[{"date":"2026-10-25","score":0.01891,"percentile":0.79421}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (1.89%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585","tags":["Mitigation","Vendor Advisory"],"source":"secure@microsoft.com"},{"url":"https://github.com/Nightmare-Eclipse/YellowKey","tags":["Exploit","Third Party Advisory"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45585","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}