CVE-2026-21533

{"id": "CVE-2026-21533", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2026-02-10T18:16:35.790", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}, {"url": "https://www.vicarius.io/vsociety/posts/cve-2026-21533-detection-script-privilege-escalation-vulnerability-in-windows-remote-desktop", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://www.vicarius.io/vsociety/posts/cve-2026-21533-mitigation-script-privilege-escalation-vulnerability-in-windows-remote-desktop", "tags": ["Mitigation", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21533", "tags": ["US Government Resource"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-269"}]}], "descriptions": [{"lang": "en", "value": "Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally."}, {"lang": "es", "value": "Gesti\u00f3n inadecuada de privilegios en Escritorio remoto de Windows permite a un atacante autorizado elevar privilegios localmente."}], "lastModified": "2026-03-30T13:27:43.870", "cisaActionDue": "2026-03-03", "cisaExploitAdd": "2026-02-10", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "E78A20FD-B910-43DF-BE89-E971E2FD0049", "versionEndExcluding": "10.0.14393.8868"}, {"criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*", "vulnerable": true, "matchCriteriaId": "B941280B-97F6-4F60-80A3-40482A74488D", "versionEndExcluding": "10.0.14393.8868"}, {"criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "C09C54DA-6AB0-4696-A2F2-C11CFC292EA9", "versionEndExcluding": "10.0.17763.8389"}, {"criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x96:*", "vulnerable": true, "matchCriteriaId": "458D2B4A-5769-48F3-BA97-F174FE89F928", "versionEndExcluding": "10.0.17763.8389"}, {"criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*", "vulnerable": true, "matchCriteriaId": "EDB3FD9A-2786-4EC1-8989-2B0D054E0307", 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"9E19FC4B-C3CC-4924-9A0B-5E4F100280D4", "versionEndExcluding": "10.0.20348.4711"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F0EA3C51-C3FE-494A-92D9-D3B1C301CB54", "versionEndExcluding": "10.0.25398.2149"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "33AF95F4-504F-40EF-9F64-5D6F7B40114F", "versionEndExcluding": "10.0.26100.32313"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com", "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.", "cisaVulnerabilityName": "Microsoft Windows Improper Privilege Management Vulnerability"}