MSRC_CVE-2026-27911

Vulnerability from csaf_microsoft - Published: 2026-04-14 07:00 - Updated: 2026-04-14 07:00
Summary
Windows User Interface Core Elevation of Privilege Vulnerability
Severity
Important
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: 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.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected products
Product Identifier Version Remediation
Windows Server 2016 10.0.14393.9060
Windows Server 2016
10.0.14393.9060
Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9060
Windows 10 Version 1607 for 32-bit Systems
10.0.14393.9060
Windows 10 Version 1607 for x64-based Systems 10.0.14393.9060
Windows 10 Version 1607 for x64-based Systems
10.0.14393.9060
Windows Server 2016 (Server Core installation) 10.0.14393.9060
Windows Server 2016 (Server Core installation)
10.0.14393.9060
Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8644
Windows 10 Version 1809 for 32-bit Systems
10.0.17763.8644
Windows 10 Version 1809 for x64-based Systems 10.0.17763.8644
Windows 10 Version 1809 for x64-based Systems
10.0.17763.8644
Windows Server 2019 10.0.17763.8644
Windows Server 2019
10.0.17763.8644
Windows Server 2019 (Server Core installation) 10.0.17763.8644
Windows Server 2019 (Server Core installation)
10.0.17763.8644
Windows Server 2022 10.0.20348.5020
Windows Server 2022
10.0.20348.5020
Windows Server 2022 (Server Core installation) 10.0.20348.5020
Windows Server 2022 (Server Core installation)
10.0.20348.5020
Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7184
Windows 10 Version 21H2 for 32-bit Systems
10.0.19044.7184
Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7184
Windows 10 Version 21H2 for ARM64-based Systems
10.0.19044.7184
Windows 10 Version 21H2 for x64-based Systems 10.0.19044.7184
Windows 10 Version 21H2 for x64-based Systems
10.0.19044.7184
Windows 10 Version 22H2 for x64-based Systems 10.0.19045.7184
Windows 10 Version 22H2 for x64-based Systems
10.0.19045.7184
Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.7184
Windows 10 Version 22H2 for ARM64-based Systems
10.0.19045.7184
Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.7184
Windows 10 Version 22H2 for 32-bit Systems
10.0.19045.7184
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.6936
Windows 11 Version 23H2 for ARM64-based Systems
10.0.22631.6936
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.6936
Windows 11 Version 23H2 for x64-based Systems
10.0.22631.6936
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2274
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.2274
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.32690
Windows 11 Version 24H2 for ARM64-based Systems
10.0.26100.32690
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.32690
Windows 11 Version 24H2 for x64-based Systems
10.0.26100.32690
Windows Server 2025 10.0.26100.32690
Windows Server 2025
10.0.26100.32690
Windows Server 2025 (Server Core installation) 10.0.26100.32690
Windows Server 2025 (Server Core installation)
10.0.26100.32690
Windows 11 Version 25H2 for ARM systems 10.0.26200.8246
Windows 11 Version 25H2 for ARM systems
10.0.26200.8246
Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8246
Windows 11 Version 25H2 for x64-based Systems
10.0.26200.8246
Windows 11 version 26H1 for x64-based Systems 10.0.28000.1836
Windows 11 version 26H1 for x64-based Systems
10.0.28000.1836
Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.1836
Windows 11 Version 26H1 for ARM64-based Systems
10.0.28000.1836
Product Identifier Version Remediation
Windows 11 Version 26H1 for ARM64-based Systems <10.0.28000.1836
Windows 11 Version 26H1 for ARM64-based Systems
<10.0.28000.1836
Vendor Fix fix
Windows 11 version 26H1 for x64-based Systems <10.0.28000.1836
Windows 11 version 26H1 for x64-based Systems
<10.0.28000.1836
Vendor Fix fix
Windows 11 Version 25H2 for x64-based Systems <10.0.26200.8246
Windows 11 Version 25H2 for x64-based Systems
<10.0.26200.8246
Vendor Fix fix
Windows 11 Version 25H2 for ARM systems <10.0.26200.8246
Windows 11 Version 25H2 for ARM systems
<10.0.26200.8246
Vendor Fix fix
Windows Server 2025 (Server Core installation) <10.0.26100.32690
Windows Server 2025 (Server Core installation)
<10.0.26100.32690
Vendor Fix fix
Windows Server 2025 <10.0.26100.32690
Windows Server 2025
<10.0.26100.32690
Vendor Fix fix
Windows 11 Version 24H2 for x64-based Systems <10.0.26100.32690
Windows 11 Version 24H2 for x64-based Systems
<10.0.26100.32690
Vendor Fix fix
Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.32690
Windows 11 Version 24H2 for ARM64-based Systems
<10.0.26100.32690
Vendor Fix fix
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.2274
Windows Server 2022, 23H2 Edition (Server Core installation)
<10.0.25398.2274
Vendor Fix fix
Windows 11 Version 23H2 for x64-based Systems <10.0.22631.6936
Windows 11 Version 23H2 for x64-based Systems
<10.0.22631.6936
Vendor Fix fix
Windows 11 Version 23H2 for ARM64-based Systems <10.0.22631.6936
Windows 11 Version 23H2 for ARM64-based Systems
<10.0.22631.6936
Vendor Fix fix
Windows 10 Version 22H2 for 32-bit Systems <10.0.19045.7184
Windows 10 Version 22H2 for 32-bit Systems
<10.0.19045.7184
Vendor Fix fix
Windows 10 Version 22H2 for ARM64-based Systems <10.0.19045.7184
Windows 10 Version 22H2 for ARM64-based Systems
<10.0.19045.7184
Vendor Fix fix
Windows 10 Version 22H2 for x64-based Systems <10.0.19045.7184
Windows 10 Version 22H2 for x64-based Systems
<10.0.19045.7184
Vendor Fix fix
Windows 10 Version 21H2 for x64-based Systems <10.0.19044.7184
Windows 10 Version 21H2 for x64-based Systems
<10.0.19044.7184
Vendor Fix fix
Windows 10 Version 21H2 for ARM64-based Systems <10.0.19044.7184
Windows 10 Version 21H2 for ARM64-based Systems
<10.0.19044.7184
Vendor Fix fix
Windows 10 Version 21H2 for 32-bit Systems <10.0.19044.7184
Windows 10 Version 21H2 for 32-bit Systems
<10.0.19044.7184
Vendor Fix fix
Windows Server 2022 (Server Core installation) <10.0.20348.5020
Windows Server 2022 (Server Core installation)
<10.0.20348.5020
Vendor Fix fix
Windows Server 2022 <10.0.20348.5020
Windows Server 2022
<10.0.20348.5020
Vendor Fix fix
Windows Server 2019 (Server Core installation) <10.0.17763.8644
Windows Server 2019 (Server Core installation)
<10.0.17763.8644
Vendor Fix fix
Windows Server 2019 <10.0.17763.8644
Windows Server 2019
<10.0.17763.8644
Vendor Fix fix
Windows 10 Version 1809 for x64-based Systems <10.0.17763.8644
Windows 10 Version 1809 for x64-based Systems
<10.0.17763.8644
Vendor Fix fix
Windows 10 Version 1809 for 32-bit Systems <10.0.17763.8644
Windows 10 Version 1809 for 32-bit Systems
<10.0.17763.8644
Vendor Fix fix
Windows Server 2016 (Server Core installation) <10.0.14393.9060
Windows Server 2016 (Server Core installation)
<10.0.14393.9060
Vendor Fix fix
Windows 10 Version 1607 for x64-based Systems <10.0.14393.9060
Windows 10 Version 1607 for x64-based Systems
<10.0.14393.9060
Vendor Fix fix
Windows 10 Version 1607 for 32-bit Systems <10.0.14393.9060
Windows 10 Version 1607 for 32-bit Systems
<10.0.14393.9060
Vendor Fix fix
Windows Server 2016 <10.0.14393.9060
Windows Server 2016
<10.0.14393.9060
Vendor Fix fix
Threats
Impact Elevation of Privilege
Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely
Acknowledgments
Anonymous

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  "vulnerabilities": [
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      "cwe": {
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        "name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)"
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          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "Successful exploitation of this vulnerability requires an attacker to win a race condition.",
          "title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "This vulnerability could lead to a contained execution environment escape. Please refer to AppContainer Isolation for more information.",
          "title": "According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "An attacker could use this vulnerability to elevate privileges from a Low Integrity Level in a contained (\u0026quot;sandboxed\u0026quot;) execution environment to a Medium Integrity Level. Please refer to AppContainer isolation and Mandatory Integrity Control for more information.",
          "title": "What privileges could be gained by an attacker who successfully exploited the vulnerability?"
        }
      ],
      "product_status": {
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          "10816",
          "10852",
          "10853",
          "10855",
          "11568",
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      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-27911 Windows User Interface Core Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27911"
        },
        {
          "category": "self",
          "summary": "CVE-2026-27911 Windows User Interface Core Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-27911.json"
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            "attackComplexity": "HIGH",
            "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": "CHANGED",
            "temporalScore": 6.8,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
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            "20",
            "21",
            "22",
            "23",
            "24",
            "25",
            "26",
            "27"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely"
        }
      ],
      "title": "Windows User Interface Core Elevation of Privilege Vulnerability"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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Detection rules are retrieved from Rulezet.

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