MSRC_CVE-2026-20817

Vulnerability from csaf_microsoft - Published: 2026-01-13 08:00 - Updated: 2026-01-13 08:00
Summary
Windows Error Reporting Service 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.
CVE-2026-20817
7.8 (High)
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
CWE-280 - Improper Handling of Insufficient Permissions or Privileges
Affected products
Product Identifier Version Remediation
Windows Server 2022 10.0.20348.4648
Windows Server 2022
 10.0.20348.4648
Windows Server 2022 (Server Core installation) 10.0.20348.4648
Windows Server 2022 (Server Core installation)
 10.0.20348.4648
Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.6809
Windows 10 Version 21H2 for 32-bit Systems
 10.0.19044.6809
Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.6809
Windows 10 Version 21H2 for ARM64-based Systems
 10.0.19044.6809
Windows 10 Version 21H2 for x64-based Systems 10.0.19044.6809
Windows 10 Version 21H2 for x64-based Systems
 10.0.19044.6809
Windows 10 Version 22H2 for x64-based Systems 10.0.19045.6809
Windows 10 Version 22H2 for x64-based Systems
 10.0.19045.6809
Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.6809
Windows 10 Version 22H2 for ARM64-based Systems
 10.0.19045.6809
Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.6809
Windows 10 Version 22H2 for 32-bit Systems
 10.0.19045.6809
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.6491
Windows 11 Version 23H2 for ARM64-based Systems
 10.0.22631.6491
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.6491
Windows 11 Version 23H2 for x64-based Systems
 10.0.22631.6491
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2092
Windows Server 2022, 23H2 Edition (Server Core installation)
 10.0.25398.2092
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.7623
Windows 11 Version 24H2 for ARM64-based Systems
 10.0.26100.7623
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.7623
Windows 11 Version 24H2 for x64-based Systems
 10.0.26100.7623
Windows Server 2025 10.0.26100.32230
Windows Server 2025
 10.0.26100.32230
Windows Server 2025 (Server Core installation) 10.0.26100.32230
Windows Server 2025 (Server Core installation)
 10.0.26100.32230
Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.7623
Windows 11 Version 25H2 for ARM64-based Systems
 10.0.26200.7623
Windows 11 Version 25H2 for x64-based Systems 10.0.26200.7623
Windows 11 Version 25H2 for x64-based Systems
 10.0.26200.7623
Product Identifier Version Remediation
Windows 11 Version 25H2 for x64-based Systems <10.0.26200.7623
Windows 11 Version 25H2 for x64-based Systems
 <10.0.26200.7623
Vendor Fix fix
Windows 11 Version 25H2 for ARM64-based Systems <10.0.26200.7623
Windows 11 Version 25H2 for ARM64-based Systems
 <10.0.26200.7623
Vendor Fix fix
Windows Server 2025 (Server Core installation) <10.0.26100.32230
Windows Server 2025 (Server Core installation)
 <10.0.26100.32230
Vendor Fix fix
Windows Server 2025 <10.0.26100.32230
Windows Server 2025
 <10.0.26100.32230
Vendor Fix fix
Windows 11 Version 24H2 for x64-based Systems <10.0.26100.7623
Windows 11 Version 24H2 for x64-based Systems
 <10.0.26100.7623
Vendor Fix fix
Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.7623
Windows 11 Version 24H2 for ARM64-based Systems
 <10.0.26100.7623
Vendor Fix fix
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.2092
Windows Server 2022, 23H2 Edition (Server Core installation)
 <10.0.25398.2092
Vendor Fix fix
Windows 11 Version 23H2 for x64-based Systems <10.0.22631.6491
Windows 11 Version 23H2 for x64-based Systems
 <10.0.22631.6491
Vendor Fix fix
Windows 11 Version 23H2 for ARM64-based Systems <10.0.22631.6491
Windows 11 Version 23H2 for ARM64-based Systems
 <10.0.22631.6491
Vendor Fix fix
Windows 10 Version 22H2 for 32-bit Systems <10.0.19045.6809
Windows 10 Version 22H2 for 32-bit Systems
 <10.0.19045.6809
Vendor Fix fix
Windows 10 Version 22H2 for ARM64-based Systems <10.0.19045.6809
Windows 10 Version 22H2 for ARM64-based Systems
 <10.0.19045.6809
Vendor Fix fix
Windows 10 Version 22H2 for x64-based Systems <10.0.19045.6809
Windows 10 Version 22H2 for x64-based Systems
 <10.0.19045.6809
Vendor Fix fix
Windows 10 Version 21H2 for x64-based Systems <10.0.19044.6809
Windows 10 Version 21H2 for x64-based Systems
 <10.0.19044.6809
Vendor Fix fix
Windows 10 Version 21H2 for ARM64-based Systems <10.0.19044.6809
Windows 10 Version 21H2 for ARM64-based Systems
 <10.0.19044.6809
Vendor Fix fix
Windows 10 Version 21H2 for 32-bit Systems <10.0.19044.6809
Windows 10 Version 21H2 for 32-bit Systems
 <10.0.19044.6809
Vendor Fix fix
Windows Server 2022 (Server Core installation) <10.0.20348.4648
Windows Server 2022 (Server Core installation)
 <10.0.20348.4648
Vendor Fix fix
Windows Server 2022 <10.0.20348.4648
Windows Server 2022
 <10.0.20348.4648
Vendor Fix fix
Threats
Impact Elevation of Privilege
Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely
References
Acknowledgments
Ruslan Sayfiev with <a href="https://gmo-cybersecurity.com/">GMO Cybersecurity by Ierae</a>
Denis Faiustov with <a href="https://gmo-cybersecurity.com/">GMO Cybersecurity by Ierae</a>
To clipboard 

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        "name": "Improper Handling of Insufficient Permissions or Privileges"
      },
      "notes": [
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          "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?"
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      "product_status": {
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        ],
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          "3",
          "4",
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          "8",
          "9",
          "10",
          "11",
          "12",
          "13",
          "14",
          "15",
          "16",
          "17"
        ]
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        },
        {
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          "summary": "CVE-2026-20817 Windows Error Reporting Service Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-20817.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.20348.4648:Security Update:https://support.microsoft.com/help/5073457",
          "product_ids": [
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            "16"
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          "url": "https://support.microsoft.com/help/5073457"
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        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724",
          "product_ids": [
            "15",
            "14",
            "13"
          ],
          "url": "https://support.microsoft.com/help/5073724"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724",
          "product_ids": [
            "12",
            "11",
            "10"
          ],
          "url": "https://support.microsoft.com/help/5073724"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.26100.32230:Security Update:https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da",
          "product_ids": [
            "3",
            "4"
          ],
          "url": "https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.26200.7623:Security Update:https://support.microsoft.com/help/5074109",
          "product_ids": [
            "2",
            "1"
          ],
          "url": "https://support.microsoft.com/help/5074109"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.22631.6491:Security Update:https://support.microsoft.com/help/5073455",
          "product_ids": [
            "9",
            "8"
          ],
          "url": "https://support.microsoft.com/help/5073455"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.25398.2092:Security Update:https://support.microsoft.com/help/5073450",
          "product_ids": [
            "7"
          ],
          "url": "https://support.microsoft.com/help/5073450"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.26100.7623:Security Update:https://support.microsoft.com/help/5074109",
          "product_ids": [
            "6",
            "5"
          ],
          "url": "https://support.microsoft.com/help/5074109"
        }
      ],
      "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",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10",
            "11",
            "12",
            "13",
            "14",
            "15",
            "16",
            "17"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely"
        }
      ],
      "title": "Windows Error Reporting Service Elevation of Privilege Vulnerability"
    }
  ]
}


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Tags
Taxonomy of the tags.




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.



Detection rules are retrieved from Rulezet.