Security Advisory

CVE-2026-31876

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-03-11 18:17:08

Last updated 2026-03-12 20:08:12

Assigner GitHub_M

State PUBLISHED

Description

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 Notesnooks 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 without escaping, which was then assigned to the srcdoc attribute of an <iframe>. This vulnerability is fixed in 3.3.9.

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