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CVE-2026-20824 is a protection mechanism failure in Windows Remote Assistance that allows an unauthorized attacker to bypass the Mark of the Web (MOTW) security feature. The issue stems from how Windows Remote Assistance validates and processes downloaded content, resulting in incorrect enforcement of MOTW protections on specially crafted files. Exploitation requires local execution and user interaction, typically by convincing a victim to open a malicious file delivered via phishing, collaboration platforms, or a compromised or attacker-controlled website. Microsoft classifies the issue as a Security Feature Bypass.
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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.
8 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.