CVE-2026-20817 is a local privilege escalation vulnerability in Windows Error Reporting affecting multiple versions of Microsoft Windows 10, 11, and Server. An authorized attacker with low privileges can exploit this flaw due to insufficient permission handling. With a CVSS score of 7.8 (HIGH), successful exploitation grants high confidentiality, integrity, and availability impacts. While there is no public exploit code available (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, indicating high awareness. It is not currently listed in CISA's KEV catalog and is not actively exploited.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 10.0.19044.6809CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* | ||
< 10.0.19045.6809CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:* | ||
< 10.0.22631.6491CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:* | ||
< 10.0.26100.7623CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:* | ||
< 10.0.26200.7623CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.