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CVE-2026-20824 is a security feature bypass vulnerability in Windows Remote Assistance caused by improper enforcement of downloaded-content protections. The flaw is classified as a protection mechanism failure and allows Windows Remote Assistance to incorrectly validate or process content originating from the internet, enabling bypass of Mark of the Web (MOTW) protections. In practical terms, a specially crafted file can be presented to a user in a way that avoids the normal MOTW-based safeguards that Windows and dependent security controls apply to internet-sourced content. Exploitation requires local execution and user interaction, typically by convincing a target to open the crafted file. The vulnerability affects multiple supported Windows client and server platforms and was addressed by Microsoft in January 2026 security updates.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Remote Assistance protection mechanism failure that enables bypass of Mark of the Web (MOTW) tagging/enforcement, reducing security prompts and other MOTW-dependent defenses for internet-origin files and thereby improving attacker success in file-based/social-engineering attack chains.
A Windows Remote Assistance security feature bypass (protection mechanism failure) that allows attackers to circumvent Mark of the Web (MOTW) protections on downloaded content, potentially enabling execution/evasion scenarios via user-opened crafted files.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.