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 serve as both a plain text and rich text editor. An attacker only needed to create a Markdown file containing file:// links pointing to executables or special URIs like ms-appinstaller://, and a Ctrl+click in Markdown mo...