Protection Mechanism Failure in Windows and Windows Server - CVE-2026-20824
Published: January 13, 2026
Vulnerability identifier: #VU121333
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-20824
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in Windows Remote Assistance. A remote attacker can trick a victim to open a specially crafted file and evade Mark of the Web (MOTW) defenses.
How to mitigate CVE-2026-20824
Install updates from vendor's website.