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Medium severity5.4NVD Advisory· Published Mar 11, 2026· Updated Jun 17, 2026

CVE-2026-31876

CVE-2026-31876

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 . This vulnerability is fixed in 3.3.9.

Affected products

6
  • Streetwriters/Notesnook Desktop
    cpe:2.3:a:streetwriters:notesnook_desktop:*:*:*:*:*:*:*:*
    Range: <3.3.9
  • Streetwriters/Notesnook Mobile3 versions
    cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:android:*:*+ 2 more
    • cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:android:*:*range: <3.3.15
    • cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:iphone_os:*:*range: <3.3.15
    • (no CPE)range: < 3.3.9
  • GitHub/notesnookllm-create
    Range: <3.3.9
  • Notesnook/Notesnookllm-fuzzy
    Range: <3.3.9

Patches

Vulnerability mechanics

References

2

News mentions

0

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