HIGH 7.8 Microsoft PoC
CVE-2026-20817
Windows Error Reporting Service Elevation of Privilege Vulnerability
Microsoft Security Update 2026-Jan: Windows Error Reporting Service Elevation of Privilege Vulnerability
Affected Products
- Windows Server 2022
- Windows Server 2022 (Server Core installation)
- Windows 10 Version 21H2 for 32-bit Systems
- Windows 10 Version 21H2 for ARM64-based Systems
- Windows 10 Version 21H2 for x64-based Systems
- Windows 10 Version 22H2 for x64-based Systems
- Windows 10 Version 22H2 for ARM64-based Systems
- Windows 10 Version 22H2 for 32-bit Systems
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817
- https://nvd.nist.gov/vuln/detail/CVE-2026-20817
This high severity vulnerability with a CVSS score of 7.8 was published on 2026-01-13 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. EPSS score: 5.3% (top 8% of all CVEs by exploitation probability). Affected: Windows Server 2022, Windows Server 2022 (Server Core installation), Windows 10 Version 21H2 for 32-bit Systems and 5 more.
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