CVE-2026-31876
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
ProductStreetwriters Notesnook Desktop
PublishedMar 11, 2026
First seenMar 11, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- streetwriters notesnook_desktop3.3.9 or later
- streetwriters notesnook_mobile3.3.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| streetwriters notesnook_desktop | v < 3.3.9 | 3.3.9 |
| streetwriters notesnook_mobile | v < 3.3.15 | 3.3.15 |
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