CVE-2026-31876 Notesnook has Stored XSS via unsanitized Twitter/X embed URL in editor (`tweetToEmbed`)

Notesnook is a note-taking app focused on user privacy & ease of use. Prior to 3.3.9, a Stored Cross-Site Scripting XSS vulnerability existed in Notesnook's editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed function in component.tsx interpolated the user-supplied URL...

CVE-2026-31876

Notesnook before version 3.3.9 was vulnerable to a Stored XSS in the editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed() function in component.tsx interpolated the user-supplied URL directly into an HTML string assigned to the srcdoc attribute of an iframe, enabling scr...

CVE-2026-31876: Improper Neutralization of Input During Web Page Generation

Notesnook is a note-taking app focused on user privacy & ease of use. Prior to 3.3.9, a Stored Cross-Site Scripting XSS vulnerability existed in Notesnook's editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed function in component.tsx interpolated the user-supplied URL...