CVE-2026-33955: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in streetwriters Notesnook Web/Desktop
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.
AI Analysis
Technical Summary
Notesnook versions before 3.3.11 contain a stored cross-site scripting vulnerability in the note history comparison viewer. The vulnerability is triggered when an attacker-controlled note header is rendered using dangerouslySetInnerHTML without proper sanitization. In the desktop version, this XSS can escalate to remote code execution because Electron is configured with nodeIntegration: true and contextIsolation: false, and the full backup and restore feature allows execution of malicious code. The vendor fixed this issue in version 3.3.11.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on the desktop application by leveraging the XSS vulnerability combined with Electron's insecure configuration and the backup/restore feature. This can lead to full compromise of the affected system, including confidentiality, integrity, and availability impacts. The CVSS score of 8.6 reflects the high impact and exploitability of this vulnerability.
Mitigation Recommendations
Upgrade Notesnook Web/Desktop to version 3.3.11 or later, which contains the official fix for this vulnerability. Users running affected versions should apply this update promptly to mitigate the risk of remote code execution. No additional mitigations are indicated by the vendor advisory.
CVE-2026-33955: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in streetwriters Notesnook Web/Desktop
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Notesnook versions before 3.3.11 contain a stored cross-site scripting vulnerability in the note history comparison viewer. The vulnerability is triggered when an attacker-controlled note header is rendered using dangerouslySetInnerHTML without proper sanitization. In the desktop version, this XSS can escalate to remote code execution because Electron is configured with nodeIntegration: true and contextIsolation: false, and the full backup and restore feature allows execution of malicious code. The vendor fixed this issue in version 3.3.11.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on the desktop application by leveraging the XSS vulnerability combined with Electron's insecure configuration and the backup/restore feature. This can lead to full compromise of the affected system, including confidentiality, integrity, and availability impacts. The CVSS score of 8.6 reflects the high impact and exploitability of this vulnerability.
Mitigation Recommendations
Upgrade Notesnook Web/Desktop to version 3.3.11 or later, which contains the official fix for this vulnerability. Users running affected versions should apply this update promptly to mitigate the risk of remote code execution. No additional mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-24T19:50:52.106Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69c6fa4f3c064ed76ffa5f12
Added to database: 3/27/2026, 9:44:47 PM
Last enriched: 4/4/2026, 5:58:13 AM
Last updated: 5/11/2026, 6:08:25 AM
Views: 50
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