What’s Vulnerable › Vulnerabilities
CVE-2026-33955: Notesnook vulnerable to RCE via stored XSS in Note History diff viewer
- Severity: high (CVSS 8.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-27 · updated 2026-10-25
- Weakness: CWE-79
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
- streetwriters Notesnook Web/Desktop: before 3.3.11 — fixed in 3.3.11
How to fix
Upgrade to a fixed version: streetwriters Notesnook Web/Desktop 3.3.11. Check the vendor advisory for mitigations.
References
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