CVE-2026-33955
Notesnook vulnerable to RCE via stored XSS in Note History diff viewer
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.
INFO
Published Date :
March 27, 2026, 10:16 p.m.
Last Modified :
April 2, 2026, 2:16 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Notesnook to version 3.3.11 or later.
- Avoid displaying attacker-controlled content directly.
- Sanitize user input before rendering.
- Review Electron security configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33955.
| URL | Resource |
|---|---|
| https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33955 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33955
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33955 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33955 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 02, 2026
Action Type Old Value New Value Removed Reference https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v Removed Reference Type https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v Types: Exploit, Vendor Advisory -
Initial Analysis by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:streetwriters:notesnook_desktop:*:*:*:*:*:*:*:* versions up to (excluding) 3.3.11 Added Reference Type GitHub, Inc.: https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 30, 2026
Action Type Old Value New Value Added Reference https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v -
New CVE Received by [email protected]
Mar. 27, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Added CWE CWE-79 Added CWE CWE-94 Added Reference https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v