EUVD-2026-17962
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Lifecycle Timeline
3Description
Notesnook is a note-taking app focused on user privacy & ease of use. Prior to version 3.3.17, a stored XSS vulnerability exists in the mobile share / web clip flow because attacker-controlled clip metadata is concatenated into HTML without escaping and then rendered with innerHTML inside the mobile share editor WebView. An attacker can control the shared title metadata (for example through Android/iOS share metadata such as TITLE / SUBJECT, or through link-preview title data) and inject HTML such as </a><img src=x onerror=...>. When the victim opens the Notesnook share flow and selects Web clip, the payload is inserted into the generated HTML and executed in the mobile editor WebView. This issue has been patched in version 3.3.17.
Analysis
Stored cross-site scripting (XSS) in Notesnook mobile versions prior to 3.3.17 allows remote attackers to execute arbitrary JavaScript in the share editor WebView by injecting malicious HTML through unescaped clip metadata (title, subject, or link-preview data). When a victim opens the Notesnook share flow and selects Web clip, the attacker's payload executes with access to local context and user data. …
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External POC / Exploit Code
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