CVE-2026-33955CWE-79CWE-94

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

High · published March 27, 2026

CVSS v3.1
8.6
EPSS
0%
Percentile
16.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.6 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00261 · 16.9th percentile
Weaknesses
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'); CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-03-27T21:27Z
EPSS history
Timeline
  • 27 MAR 21:27Z
    Notesnook vulnerable to RCE via stored XSS in Note History diff viewer
    cvelistv5