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Vulnerability · Published Jan 13, 2026 · Assigned by microsoft

CVE-2026-20817Windows Error Reporting Service Elevation of Privilege Vulnerability

High 7.8

In plain English

A high-severity security flaw in Windows 10 Version 21H2 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 5.4% (higher than 93% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)5.4%top 7.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

Improper handling of insufficient permissions or privileges in Windows Error Reporting allows an authorized attacker to elevate privileges locally.

Affected products (as reported)

VendorProductVersions
Microsoft Windows 10 Version 21H2 10.0.19044.0 – before 10.0.19044.6809
Microsoft Windows 10 Version 22H2 10.0.19045.0 – before 10.0.19045.6809
Microsoft Windows 11 version 23H2 10.0.22631.0 – before 10.0.22631.6491
Microsoft Windows 11 Version 23H2 10.0.22631.0 – before 10.0.22631.6491
Microsoft Windows 11 Version 24H2 10.0.26100.0 – before 10.0.26100.7623
Microsoft Windows 11 Version 25H2 10.0.26200.0 – before 10.0.26200.7623
Microsoft Windows Server 2022 10.0.20348.0 – before 10.0.20348.4648
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 – before 10.0.25398.2092
Microsoft Windows Server 2025 10.0.26100.0 – before 10.0.26100.32230
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 – before 10.0.26100.32230

Weakness: CWE-280 · Vector: 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

References