CVE-2026-33955

Notesnook vulnerable to RCE via stored XSS in Note History diff viewer

State: Published
Severity: 8.6 High
Published: Mar 27, 2026
Updated: Apr 3, 2026
Reserved: Mar 24, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94 Improper Control of Generation of Code ('Code Injection')

Affected Products

Product	Versions
Notesnook Web/Desktopstreetwriters	< 3.3.11Affected

References

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

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