EUVD-2026-16874
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
3Description
Notesnook is a note-taking app. Prior to version 3.3.11 on Web/Desktop and 3.3.17 on Android/iOS, a stored XSS in the Web Clipper rendering flow can be escalated to remote code execution in the desktop app. The root cause is that the clipper preserves attacker-controlled attributes from the source page’s root element and stores them inside web-clip HTML. When the clip is later opened, Notesnook renders that HTML into a same-origin, unsandboxed iframe using `contentDocument.write(...)`. Event-handler attributes such as `onload`, `onclick`, or `onmouseover` execute in the Notesnook origin. In the desktop app, this becomes RCE because Electron is configured with `nodeIntegration: true` and `contextIsolation: false`. Version 3.3.11 Web/Desktop and 3.3.17 on Android/iOS patch the issue.
Analysis
Remote code execution via stored XSS in Notesnook Web Clipper affects all platforms prior to version 3.3.11 (Web/Desktop) and 3.3.17 (Android/iOS). Attackers can inject malicious HTML attributes into clipped web content that execute JavaScript in the application's security context when victims open the clip. …
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Remediation
Within 24 hours: Identify all Notesnook Web Clipper installations across your organization using asset inventory or mobile device management; communicate mandatory upgrade requirement to all users. Within 7 days: Update Web/Desktop instances to version 3.3.11 or later and Android/iOS instances to version 3.3.17 or later; verify completion through patch management tools. …
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External POC / Exploit Code
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