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CVE-2026-21250

HighPublished

Windows HTTP.sys Elevation of Privilege Vulnerability

Published: Feb 10, 2026
Updated: Aug 19, 2026
Assigning CNA: microsoft
Evidence observed: May 4, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

1.1%

Low · next 30 days

Percentile: 63.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

Sources

CVE-2026-21250Informational
Technical documentation and resources for CVE-2026-21250, a Windows HTTP.sys local privilege escalation vulnerability, including affected versions, CVSS details, and mitigation guidance.
Windows 11 24H2 - Local Privilege EscalationExploit
3302509675 · windows · May 4, 2026

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