CVE-2026-45585Microsoft is aware of a security feature bypass vulnerability in Windows publicly referred to as "YellowKey".
Updated under an hour ago ()
Does this affect you?
It affects microsoft windows_11_24h2 and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.8 MEDIUM (v3.1, NVD)CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-77
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
microsoft windows_11_24h2 microsoft:windows_11_24h2 | all versions | NVD |
microsoft windows_11_25h2 microsoft:windows_11_25h2 | all versions | NVD |
microsoft windows_11_26h1 microsoft:windows_11_26h1 | all versions | NVD |
microsoft windows_server_2025 microsoft:windows_server_2025 | all versions | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585mitigation, vendor-advisory
- https://github.com/Nightmare-Eclipse/YellowKeyexploit, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.