CVE-2026-33955 — Notesnook vulnerable to RCE via stored XSS in Note History diff viewer

Description (CNA)

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 (CNA)

Vendor / product	Versions
streetwriters / Notesnook Web/Desktop	affected < 3.3.11

CWE

CWE-79, CWE-94

References

https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.