{ "document": { "acknowledgments": [ { "names": [ "BochengXiang(@Crispr) with FDU" ] } ], "aggregate_severity": { "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Public", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en-US", "notes": [ { "category": "general", "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle", "title": "Additional Resources" }, { "category": "legal_disclaimer", "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.", "title": "Disclaimer" }, { "category": "general", "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.", "title": "Customer Action" } ], "publisher": { "category": "vendor", "contact_details": "secure@microsoft.com", "name": "Microsoft Security Response Center", "namespace": "https://msrc.microsoft.com" }, "references": [ { "category": "self", "summary": "CVE-2026-42834 Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability - HTML", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42834" }, { "category": "self", "summary": "CVE-2026-42834 Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability - CSAF", "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-42834.json" }, { "category": "external", "summary": "Microsoft Exploitability Index", "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1" }, { "category": "external", "summary": "Microsoft Support Lifecycle", "url": "https://support.microsoft.com/lifecycle" }, { "category": "external", "summary": "Common Vulnerability Scoring System", "url": "https://www.first.org/cvss" } ], "title": "Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability", "tracking": { "current_release_date": "2026-05-19T07:00:00.000Z", "generator": { "date": "2026-05-21T07:29:50.926Z", "engine": { "name": "MSRC Generator", "version": "1.0" } }, "id": "msrc_CVE-2026-42834", "initial_release_date": "2026-05-12T07:00:00.000Z", "revision_history": [ { "date": "2026-05-19T07:00:00.000Z", "legacy_version": "1", "number": "1", "summary": "Information published. This CVE was addressed by updates that were released in May 2026, but the CVE was inadvertently omitted from the May 2026 Security Updates. This is an informational change only. Customers who have already installed the May 2026 updates do not need to take any further action." } ], "status": "final", "version": "1" } }, "product_tree": { "branches": [ { "branches": [ { "category": "product_version_range", "name": "<0.72.0.0.", "product": { "name": "Windows Admin Center in Azure Portal <0.72.0.0.", "product_id": "1" } }, { "category": "product_version", "name": "0.72.0.0.", "product": { "name": "Windows Admin Center in Azure Portal 0.72.0.0.", "product_id": "12518" } } ], "category": "product_name", "name": "Windows Admin Center in Azure Portal" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-42834", "cwe": { "id": "CWE-59", "name": "Improper Link Resolution Before File Access ('Link Following')" }, "notes": [ { "category": "general", "text": "Microsoft", "title": "Assigning CNA" }, { "category": "faq", "text": "An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.", "title": "What privileges could be gained by an attacker who successfully exploited this vulnerability?" }, { "category": "faq", "text": "Customers should install the latest version of the Windows Admin Center extension through the Azure Portal. There is no direct download link; instead, customers need to open the Extensions + Applications blade for their virtual machine in the Azure Portal and search for the extension named AdminCenter (Microsoft.AdminCenter.AdminCenter). From there, they can add or update the extension following the standard Azure VM extension installation process described here.", "title": "What customer action needs to take place to mitigate the vulnerability?" } ], "product_status": { "fixed": [ "12518" ], "known_affected": [ "1" ] }, "references": [ { "category": "self", "summary": "CVE-2026-42834 Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability - HTML", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42834" }, { "category": "self", "summary": "CVE-2026-42834 Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability - CSAF", "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-42834.json" } ], "remediations": [ { "category": "vendor_fix", "date": "2026-05-19T07:00:00.000Z", "details": "0.72.0.0.:Security Update:https://learn.microsoft.com/en-us/windows-server/manage/windows-admin-center/azure/extension-release-notes", "product_ids": [ "1" ], "url": "https://learn.microsoft.com/en-us/windows-server/manage/windows-admin-center/azure/extension-release-notes" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "environmentalsScore": 0.0, "exploitCodeMaturity": "UNPROVEN", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "remediationLevel": "OFFICIAL_FIX", "reportConfidence": "CONFIRMED", "scope": "UNCHANGED", "temporalScore": 6.8, "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C", "version": "3.1" }, "products": [ "1" ] } ], "threats": [ { "category": "impact", "details": "Elevation of Privilege" }, { "category": "exploit_status", "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely" } ], "title": "Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability" } ] }