Improper Access Control in Windows HTTP.sys Enables Privilege Escalation

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description

Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.

CVSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-01-13

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-20929

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	http.sys	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability is an improper access control issue in Windows HTTP.sys that allows an authorized attacker to elevate their privileges over a network. [1]

Impact Analysis

An attacker who is already authorized can exploit this vulnerability to gain higher privileges, potentially leading to full control over the affected system. [1]

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