CVE-2026-31876
Notesnook has Stored XSS via unsanitized Twitter/X embed URL in editor (`tweetToEmbed`)
CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | streetwriters |
| Product | notesnook |
| Published | Mar 11, 2026 |
| Last Updated | Mar 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
streetwriters / notesnook
< 3.3.9