Microsoft has patched a high-severity vulnerability in Windows 11’s Notepad that allowed attackers to silently execute local or remote programs when a user clicked a specially crafted Markdown link, all without triggering any Windows security warning.
The flaw, tracked as CVE-2026-20841 and fixed in the February 2026 Patch Tuesday update, stemmed from Notepad’s relatively new Markdown support — a feature Microsoft added after discontinuing WordPad and rewriting Notepad to…

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