Vulnerability · Published Mar 27, 2026 · Assigned by GitHub_M
CVE-2026-33955Notesnook vulnerable to RCE via stored XSS in Note History diff viewer
High 8.6
In plain English
A high-severity cross-site scripting in Notesnook Web/Desktop from streetwriters. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Official description
Notesnook is a note-taking app. Prior to version 3.3.11 on Web/Desktop, a cross-site scripting vulnerability stored in the note history comparison viewer can escalate to remote code execution in a desktop application. The issue is triggered when an attacker-controlled note header is displayed using `dangerouslySetInnerHTML` without secure handling. When combined with the full backup and restore feature in the desktop application, this becomes remote code execution because Electron is configured with `nodeIntegration: true` and `contextIsolation: false`. Version 3.3.11 patches the issue.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| streetwriters | Notesnook Web/Desktop | < 3.3.11 |
Weakness: CWE-79, CWE-94 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H