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Windows Remote Assistance Vulnerability Allow Attacker to Bypass Security Features

Microsoft has released critical security updates to address CVE-2026-20824 , a vulnerability in Windows Remote Assistance that allows attackers to bypass the Mark of the Web (MOTW) security feature.

NBy Nathan ColeJan 15, 20262 min read

Microsoft has released critical security updates to address CVE-2026-20824 , a vulnerability in Windows Remote Assistance that allows attackers to bypass the Mark of the Web (MOTW) security feature.

This vulnerability, disclosed on January 13, 2026, affects multiple Windows platforms, from Windows 10 to Windows Server 2025. CVE-2026-20824 is classified as a security feature bypass vulnerability with an Important severity rating.

The flaw enables unauthorized local attackers to evade MOTW defenses , a protection mechanism that restricts actions on files downloaded from untrusted sources.

Attribute Value

CVE Identifier CVE-2026-20824

Vulnerability Type Security Feature Bypass

Assigning CNA Microsoft

Weakness Classification CWE-693: Protection Mechanism Failure

Max Severity Important

CVSS Vector String CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

This vulnerability, disclosed on January 13, 2026, affects multiple Windows platforms, from Windows 10 to Windows Server 2025.
Nathan Cole · Thehackingpost

With a CVSS v3.1 score of 5.5, the vulnerability requires local access and user interaction to exploit, posing significant confidentiality risks. The weakness arises from a failure in Windows Remote Assistance's protection mechanism for validating and processing downloaded content.

Exploitation requires convincing users to open specially crafted files, often distributed via email or web-based attacks.

Microsoft has issued security updates for 29 distinct Windows configurations.

Product Family Versions Affected KB Articles

Windows 10 Version 1607, 1809, 21H2, 22H2 KB5073722, KB5073723, KB5073724

Windows 11 Version 23H2, 24H2, 25H2 KB5073455, KB5074109

Windows Server 2012 2012, 2012 R2 (all installations) KB5073696, KB5073698

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Windows Server 2016 All installations KB5073722

Windows Server 2019 All installations KB5073723

Windows Server 2022 All installations, 23H2 Edition KB5073457, KB5073450

Windows Server 2025 All installations KB5073379

Windows 10 Version 22H2 users across 32-bit, ARM64, and x64 systems should apply KB5073724. Windows 11 deployments, including the latest 23H2, 24H2, and 25H2 editions, require KB5073455 or KB5074109, depending on architecture.

Enterprise environments running Windows Server 2019, 2022, and 2025 should prioritize patching using their respective knowledge base articles. Microsoft classifies these updates as "Required," indicating their importance for maintaining security.

Currently, the vulnerability remains unexploited in the wild. Microsoft's assessment rates the vulnerability as "Exploitation Less Likely," due to technical barriers.

Organizations are advised to apply the updates within their standard update cycles.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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