Summaryinfo

A vulnerability described as problematic has been identified in streetwriters Notesnook Web and Notesnook Desktop up to 3.3.10. This impacts an unknown function. Such manipulation leads to cross site scripting. This vulnerability is traded as CVE-2026-33955. An attack has to be approached locally. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in streetwriters Notesnook Web and Notesnook Desktop up to 3.3.10. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

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 advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-33955 since 03/24/2026. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 3.3.11 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-16872). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• streetwriters

Name

• Notesnook Desktop
• Notesnook Web

Version

• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 3.3.5
• 3.3.6
• 3.3.7
• 3.3.8
• 3.3.9
• 3.3.10

CPE 2.3info

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CPE 2.2info

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