CVE-2026-20817

Windows Error Reporting Service Elevation of Privilege Vulnerability

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

Affected

Microsoft · Windows 10 Version 21H2 · Windows 10 Version 22H2 · Windows 11 version 23H2 · Windows 11 Version 23H2 · Windows 11 Version 24H2 · Windows 11 Version 25H2

CVSS v3.1 MICROSOFT

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

5.42% chance of exploitation in the next 30 days, 93rd percentile

Published

2026-01-13

Updated

2026-07-30

Proof-of-concept exploits (4)

• oxfemale/CVE-2026-20817130★ · 2026-02-19
• dwgth4i/CVE-2026-208170★ · 2026-05-28
• RDTUTORIAL/GhostUSB1★ · 2026-06-23
• ZeroDayEvil/CVE-2026-20817

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817

References

• CVE Record
• NVD entry

Related

• CVE-2020-15999
• CVE-2026-2636
• CVE-2026-20805
• CVE-2026-21858
• CVE-2026-40369
• CVE-2026-41096