Notepad Markdown Preview on Windows 11 Can Trigger Remote Code Execution

Security researchers have found that the new markdown preview feature in Windows 11’s Notepad can be abused to achieve remote code execution. By opening a maliciously crafted markdown file, an attacker can cause Notepad to load and execute arbitrary code without any user interaction, leveraging a flaw in the way the preview engine processes certain markup constructs.

The vulnerability gives threat actors a stealthy, native Windows vector that bypasses traditional execution controls. Defenders should prioritize applying the forthcoming patch, consider disabling markdown preview via Group Policy, and monitor for anomalous Notepad launches or loading of unexpected DLLs. Early detection and mitigation are essential to prevent exploitation in enterprise environments.

Categories: Malware & Ransomware, Compliance & Regulation, AI Security & Threats

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