CVE-2026-21533

Description

Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Overview

State: PUBLISHED
Assigner (CNA): microsoft
CVSS severity: HIGH
CVSS score: 7.8 / 10
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Effective score: 7.8 / 10 HIGH source: CNA overview
MSRC score: 7.8 / 10 HIGH MS rating: Important · Elevation of Privilege
CWE(s): CWE-269
Reserved: 2025-12-30
Published: 2026-02-10 08:00 UTC
Last updated: 2026-02-10 08:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21533.json
Linked Threat: CVE-2026-21533 — Microsoft Windows: Microsoft Windows Improper Privilege Management Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Microsoft Windows Improper Privilege Management Vulnerability
Vendor / project: Microsoft
Product: Windows
Date added to KEV: 2026-02-10
Remediation due: 2026-03-03
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware campaign use: Unknown
CISA notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21533
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-02-10 18:16:35 UTC
NVD last modified: 2026-03-30 13:27:43 UTC
NVD CVSS v3.1: 7.8 / 10 HIGH source: secure@microsoft.com
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 1.8 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.1735 (probability of exploitation in next 30 days)
EPSS percentile: 95.14% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-7343
Assigner: microsoft
Published: Feb 10, 2026, 5:51:26 PM
Updated: May 11, 2026, 9:25:24 PM
EUVD base score (CVSS 3.1): 7.8 / 10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
EUVD-reported EPSS: 17.9600
Vendors: Microsoft
Products: Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

Windows Server 2012 (6.2.9200.0 <6.2.9200.25923)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.23022)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.8868)

Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows Server 2022, 23H2 Edition (Server Core installation) (10.0.25398.0 <10.0.25398.2149)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2025 (Server Core installation) (10.0.26100.0 <10.0.26100.32370)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.8868)

Windows Server 2025 (Server Core installation) (10.0.26100.0 <10.0.26100.32370)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.8389)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.8389)

Windows Server 2012 (6.2.9200.0 <6.2.9200.25923)

Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.23022)

Windows Server 2022, 23H2 Edition (Server Core installation) (10.0.25398.0 <10.0.25398.2149)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.25923)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.23022)

Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.25923)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.23022)
Aliases: GHSA-qppx-835v-jvwp

ENISA description: Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

EUVD references (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-07-15 03:05 UTC (source: CVRF).

MS severity: Important
Impact: Elevation of Privilege
MS CVSS base score: 7.8 / 10 (temporal 7.2)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Exploit assessment: Publicly Disclosed:No;Exploited:Yes;Latest Software Release:Exploitation Detected
Release: 2026-Feb

Microsoft remediations / KB articles (28)

5077179 — Vendor Fix / Security Update (fixed build 10.0.28000.1575)
https://support.microsoft.com/help/5077179 — None Available / 5077179
5075904 — Vendor Fix / Security Update (fixed build 10.0.17763.8389)
https://support.microsoft.com/help/5075904 — None Available / 5075904
5075906 — Vendor Fix / Security Update (fixed build 10.0.20348.4773)
https://support.microsoft.com/help/5075906 — None Available / 5075906
5075943 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.20348.4711)
https://support.microsoft.com/help/5075943 — None Available / 5075943
5075912 — Vendor Fix / Security Update (fixed build 10.0.19044.6937)
https://support.microsoft.com/help/5075912 — None Available / 5075912
5075899 — Vendor Fix / Security Update (fixed build 10.0.26100.32370)
https://support.microsoft.com/help/5075899 — None Available / 5075899
5075942 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.26100.32313)
https://support.microsoft.com/help/5075942 — None Available / 5075942
5077181 — Vendor Fix / Security Update (fixed build 10.0.26200.7840)
https://support.microsoft.com/help/5077181 — None Available / 5077181
5077212 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.26200.7781)
https://support.microsoft.com/help/5077212 — None Available / 5077212
5075941 — Vendor Fix / Security Update (fixed build 10.0.22631.6649)
https://support.microsoft.com/help/5075941 — None Available / 5075941
5075897 — Vendor Fix / Security Update (fixed build 10.0.25398.2149)
https://support.microsoft.com/help/5075897 — None Available / 5075897
5075999 — Vendor Fix / Security Update (fixed build 10.0.14393.8868)
https://support.microsoft.com/help/5075999 — None Available / 5075999
5075971 — Vendor Fix / Monthly Rollup (fixed build 6.2.9200.25923)
https://support.microsoft.com/help/5075971 — None Available / 5075971
5075970 — Vendor Fix / Monthly Rollup (fixed build 6.3.9600.23022)
https://support.microsoft.com/help/5075970 — None Available / 5075970

Microsoft FAQ (1)

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Affected products (22)

Vendor	Product	Versions	Platforms
Microsoft	Windows 10 Version 1607	`10.0.14393.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 1809	`10.0.17763.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 21H2	`10.0.19044.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 10 Version 22H2	`10.0.19045.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 version 22H3	`10.0.22631.0` (affected)	ARM64-based Systems
Microsoft	Windows 11 Version 23H2	`10.0.22631.0` (affected)	x64-based Systems
Microsoft	Windows 11 Version 24H2	`10.0.26100.0` (affected)	ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 Version 25H2	`10.0.26200.0` (affected)	—
Microsoft	Windows 11 version 26H1	`10.0.28000.0` (affected)	ARM64-based Systems
Microsoft	Windows 11 Version 26H1	`10.0.28000.0` (affected)	—
Microsoft	Windows Server 2012	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 (Server Core installation)	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2	`6.3.9600.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2 (Server Core installation)	`6.3.9600.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016 (Server Core installation)	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019 (Server Core installation)	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022	`10.0.20348.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	`10.0.25398.0` (affected)	x64-based Systems
Microsoft	Windows Server 2025	`10.0.26100.0` (affected)	x64-based Systems
Microsoft	Windows Server 2025 (Server Core installation)	`10.0.26100.0` (affected)	x64-based Systems

Affected products — CPE 2.3 (23) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x96:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

Windows Remote Desktop Services Elevation of Privilege Vulnerability vendor-advisorypatch

Web references (29)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533 secure@microsoft.com Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21533 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource
https://www.vicarius.io/vsociety/posts/cve-2026-21533-detection-script-privilege-escalation-vulnerability-in-windows-remote-desktop af854a3a-2127-422b-91ae-364da2661108 Third Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2026-21533-mitigation-script-privilege-escalation-vulnerability-in-windows-remote-desktop af854a3a-2127-422b-91ae-364da2661108 MitigationThird Party Advisory

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cve	`CVE-2026-21533`	no local data	2026-05-14 02:58 UTC
cwe	`CWE-269`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-14 16:50 UTC
CVE-2026-21533 - Microsoft Windows Improper Privilege Management ...

web:cvefeed.io

Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

2026-05-14 16:50 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-05-14 16:50 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-14 16:50 UTC
Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws

web:www.bleepingcomputer.com

Today is Microsoft's March 2026 Patch Tuesday with security updates for 79 flaws, including 2 publicly disclosed zero-day vulnerabilities.

2026-05-14 16:50 UTC
CVE-2026-21533 - Vulnerability Details - OpenCVE

web:app.opencve.io

Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Apply the Microsoft security update released for CVE‑2026‑21533 as detailed on the MSRC update guide.

2026-05-14 16:50 UTC
CVE Record: CVE-2026-21533

web:www.cve.org

Platforms 32-bit Systems, ARM64-based Systems, x64-based Systems

2026-05-14 16:50 UTC
May 2026 Patch Tuesday: no zero-days but plenty to fix

web:www.malwarebytes.com

May's Patch Tuesday may not be the giant release many expected, but there are still plenty of important fixes that shouldn't be ignored.

2026-05-14 16:50 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-03-03 Known ransomware campaign use: Unknown

2026-05-14 01:13 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-21533.json.

{
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