Is CVE-2026-33955 actively exploited?

No active exploitation of CVE-2026-33955 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33955 be exploited remotely?

No. CVE-2026-33955 requires local access to exploit.

What is the CVSS score of CVE-2026-33955?

CVE-2026-33955 has a CVSS score of 8.6 (HIGH).

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HIGH

CVE-2026-33955

CWE-79Published: March 27, 2026· Updated: Apr 2, 2026

8.6

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:19.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33955 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.