Back to board Open MSRC
MSRC compact vulnerability detail

CVE-2026-20929 · Windows HTTP.sys Elevation of Privilege Vulnerability

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

Severity
Important
Impact
Elevation of Privilege
CVSS
7.5 base · 6.5 temporal
Release
2026-01-13
Signals
Windows HTTP.sys Elevation of Privilege Exploited: No Publicly disclosed: No Exploitability: Exploitation Unlikely
CWE
CWE-284: Improper Access Control
Patch Diff
Loading module diff metadata...
Resolved binary override
Use this when the MSRC module name cannot be mapped automatically or the resolved binary looks wrong.
Old version New version
Description
Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
FAQ / Articles
Windows HTTP.sys Elevation of Privilege Vulnerability
Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
FAQ
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? The Attack requires an Service Principal Name (SPN) that is registered to an account that no longer exists or is not in use, to be on the target machine.
FAQ
What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.