{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-45585", "tracking": { "current_release_date": "2026-05-21T01:34:36.517825Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-45585", "initial_release_date": "2026-05-20T00:25:21.259707Z", "revision_history": [ { "date": "2026-05-20T00:25:21.259707Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-05-20T00:25:32.029697Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-05-20T00:48:18.260799Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (5).| References created (1).| CWES updated (1)." }, { "date": "2026-05-20T00:48:28.368764Z", "number": "4", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (5).| Product Threats created (10).| CWES updated (1).| Exploitable created." }, { "date": "2026-05-20T00:48:32.988820Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-05-20T06:22:33.304758Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-05-20T08:04:53.670707Z", "number": "7", "summary": "Source connected.| CVE status created. (valid)| News created (1)." }, { "date": "2026-05-20T08:05:00.674579Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-05-20T08:29:44.933506Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| News created (1)." }, { "date": "2026-05-20T08:29:51.852821Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-05-20T09:29:50.258016Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| News created (1)." }, { "date": "2026-05-20T12:06:33.774102Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| Products connected (2).| Product Identifiers created (2).| References created (4)." }, { "date": "2026-05-20T12:06:37.401181Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-05-20T13:25:47.525401Z", "number": "14", "summary": "References created (1)." }, { "date": "2026-05-20T13:40:31.063314Z", "number": "15", "summary": "Exploits created (1).| Unknown change." }, { "date": "2026-05-20T13:40:46.699754Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-05-20T16:05:40.490797Z", "number": "17", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-05-20T16:05:52.080801Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-05-20T16:30:50.020926Z", "number": "19", "summary": "Source created.| CVE status created. (valid)| News created (1)." }, { "date": "2026-05-20T16:30:59.111634Z", "number": "20", "summary": "NCSC Score updated." }, { "date": "2026-05-20T17:27:33.366838Z", "number": "21", "summary": "Products connected (2).| Product Identifiers created (4).| Products created (2).| Exploits created (1)." }, { "date": "2026-05-20T17:27:37.616106Z", "number": "22", "summary": "NCSC Score updated." }, { "date": "2026-05-21T01:34:33.519497Z", "number": "23", "summary": "NCSC Score updated." } ], "status": "interim", "version": "23" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-3126324", "product_identification_helper": { "cpe": "cpe:/o:microsoft:windows_11:-" } } } ], "category": "product_name", "name": "Microsoft Windows 11" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-2908521", "product_identification_helper": { "cpe": "cpe:/o:microsoft:windows_server_2025:-" } } } ], "category": "product_name", "name": "Microsoft Windows Server 2025" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-7373241" } } ], "category": "product_name", "name": "Windows 11 Version 24H2" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/10.0.26100.8457", "product": { "name": "vers:microsoft/10.0.26100.8457", "product_id": "CSAFPID-6981469", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_11_24H2:10.0.26100.8457:*:*:*:*:*:x64:*" } } } ], "category": "product_name", "name": "Windows 11 Version 24H2 for x64-based Systems" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/10.0.26200.8457", "product": { "name": "vers:microsoft/10.0.26200.8457", "product_id": "CSAFPID-6981464", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_11_2H2:10.0.26200.8457:*:*:*:*:*:x64:*" } } } ], "category": "product_name", "name": "Windows 11 Version 25H2 for x64-based Systems" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/10.0.28000.2113", "product": { "name": "vers:microsoft/10.0.28000.2113", "product_id": "CSAFPID-6981471", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_11_26H1:10.0.28000.2113:*:*:*:*:*:x64:*" } } } ], "category": "product_name", "name": "Windows 11 version 26H1 for x64-based Systems" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/10.0.26100.32860", "product": { "name": "vers:microsoft/10.0.26100.32860", "product_id": "CSAFPID-6981470", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.32860:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "Windows Server 2025" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/10.0.26100.32860", "product": { "name": "vers:microsoft/10.0.26100.32860", "product_id": "CSAFPID-6981462", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.32860:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "Windows Server 2025 (Server Core installation)" } ], "category": "product_family", "name": "Windows" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-7373242" } } ], "category": "product_name", "name": "Windows 11 Version 25H2" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-7373243" } } ], "category": "product_name", "name": "Windows 11 version 26H1" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-7373244" } } ], "category": "product_name", "name": "Windows Server 2025" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-7373245" } } ], "category": "product_name", "name": "Windows Server 2025 (Server Core installation)" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-5137030", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*" } } } ], "category": "product_name", "name": "windows_11_24h2" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-2286951", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "windows_server_2025" } ], "category": "vendor", "name": "Microsoft" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-7432893", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*" } } } ], "category": "product_name", "name": "windows_11_25h2" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-7432894", "product_identification_helper": { "cpe": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*" } } } ], "category": "product_name", "name": "windows_11_26h1" } ], "category": "vendor", "name": "microsoft" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-45585", "cwe": { "id": "CWE-77", "name": "Improper Neutralization of Special Elements used in a Command ('Command Injection')" }, "notes": [ { "category": "description", "text": "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.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-45585" }, { "category": "description", "text": "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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/45xxx/CVE-2026-45585.json" }, { "category": "description", "text": "

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.

\n

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.

\n", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-May" }, { "category": "other", "text": "0.00083", "title": "EPSS" }, { "category": "other", "text": "5.0", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) product Windows H, There is news data available from source Bleepingcomputer, There is product data available from source Certbundde, There is exploit data available from a private source", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, The value of the most recent EPSS score, There is exploit data available from source Cveprojectv5, There is exploit data available from source Nvd", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-7373241", "CSAFPID-7373242", "CSAFPID-7373243", "CSAFPID-7373244", "CSAFPID-7373245", "CSAFPID-6981462", "CSAFPID-6981464", "CSAFPID-6981469", "CSAFPID-6981470", "CSAFPID-6981471", "CSAFPID-2908521", "CSAFPID-3126324", "CSAFPID-2286951", "CSAFPID-5137030", "CSAFPID-7432893", "CSAFPID-7432894" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-45585" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/45xxx/CVE-2026-45585.json" }, { "category": "external", "summary": "Source - microsoft", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-May" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0165" }, { "category": "external", "summary": "Source - bleepingcomputer", "url": "https://www.bleepingcomputer.com/news/microsoft/microsoft-shares-mitigation-for-yellowkey-windows-zero-day/" }, { "category": "external", "summary": "Source - securitynl", "url": "https://www.security.nl/posting/937337/Microsoft+waarschuwt+voor+YellowKey-lek+dat+BitLocker-encryptie+omzeilt?channel=rss" }, { "category": "external", "summary": "Source - securitynl", "url": "https://www.security.nl/posting/937337/Microsoft+waarschuwt+voor+YelowKey-lek+dat+BitLocker-encryptie+omzeilt?channel=rss" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1609.json" }, { "category": "external", "summary": "Source - securityweek", "url": "https://www.securityweek.com/microsoft-rolls-out-mitigations-for-yellowkey-bitlocker-bypass/" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "News - bleepingcomputer", "url": "https://www.bleepingcomputer.com/news/microsoft/microsoft-shares-mitigation-for-yellowkey-windows-zero-day/" }, { "category": "external", "summary": "News - securitynl", "url": "https://www.security.nl/posting/937337/Microsoft+waarschuwt+voor+YelowKey-lek+dat+BitLocker-encryptie+omzeilt?channel=rss" }, { "category": "external", "summary": "News - securitynl", "url": "https://www.security.nl/posting/937337/Microsoft+waarschuwt+voor+YellowKey-lek+dat+BitLocker-encryptie+omzeilt?channel=rss" }, { "category": "external", "summary": "News - securityweek", "url": "https://www.securityweek.com/microsoft-rolls-out-mitigations-for-yellowkey-bitlocker-bypass/" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; nvd", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1609.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1609" }, { "category": "external", "summary": "Reference - certbundde; nvd", "url": "https://github.com/Nightmare-Eclipse/YellowKey" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 6.8, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-2286951", "CSAFPID-2908521", "CSAFPID-3126324", "CSAFPID-5137030", "CSAFPID-6981462", "CSAFPID-6981464", "CSAFPID-6981469", "CSAFPID-6981470", "CSAFPID-6981471", "CSAFPID-7373241", "CSAFPID-7373242", "CSAFPID-7373243", "CSAFPID-7373244", "CSAFPID-7373245", "CSAFPID-7432893", "CSAFPID-7432894" ] } ], "threats": [ { "category": "exploit_status", "details": "Publicly Disclosed:Yes;Exploited:No;Latest Software Release:Exploitation More Likely", "product_ids": [ "CSAFPID-6981462", "CSAFPID-6981464", "CSAFPID-6981469", "CSAFPID-6981470", "CSAFPID-6981471" ] }, { "category": "impact", "details": "Security Feature Bypass", "product_ids": [ "CSAFPID-6981462", "CSAFPID-6981464", "CSAFPID-6981469", "CSAFPID-6981470", "CSAFPID-6981471" ] }, { "category": "exploit_status", "details": "exploited" } ], "title": "CVE-2026-45585" } ] }