CVE-2026-31876

Published March 11th, 2026

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CVSS v3

5.4

MEDIUM

CVSS v2

N/A

Affected

PROJECT

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 Notesnook's 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.

streetwriters/notesnook

A fully open source & end-to-end encrypted note taking alternative to Evernote.

GitHub

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