VulnerabilityModified
CVE-2026-20817
Improper handling of insufficient permissions or privileges in Windows Error Reporting allows an authorized attacker to elevate privileges locally.
HIGH 7.8EPSS 5.50%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Improper handling of insufficient permissions or privileges in Windows Error Reporting allows an authorized attacker to elevate privileges locally.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.50% probability · 92th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-280
- Affected
- microsoft/windows 10 21h2 · microsoft/windows 10 22h2 · microsoft/windows 11 23h2 · microsoft/windows 11 24h2 · microsoft/windows 11 25h2 · microsoft/windows server 2022 · microsoft/windows server 2022 23h2 · microsoft/windows server 2025
- Source
- secure@microsoft.com
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817Vendor Advisory
- https://www.vicarius.io/vsociety/posts/cve-2026-20817-detection-script-eop-vulnerabilit-in-windows-error-reporting
- https://www.vicarius.io/vsociety/posts/cve-2026-20817-mitigation-script-eop-vulnerability-in-windows-error-reporting
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.