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CVE-2026-33955

Streetwriters Notesnook Desktop remote code execution

8.6 HIGHPublic exploitEPSS 0.26%
  1. Published27 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

Streetwriters Notesnook Desktop< 3.3.11

Remediation

Fixed in
Streetwriters Notesnook Desktop≥ 3.3.11

References

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Frequently asked

Is CVE-2026-33955 being actively exploited?

CVE-2026-33955 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.26%.

How severe is CVE-2026-33955?

CVE-2026-33955 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 0.26% probability of exploitation.

Which products are affected by CVE-2026-33955?

Affected products include Streetwriters Notesnook Desktop.

How do I fix CVE-2026-33955?

Upgrade affected software to a fixed version, for example Streetwriters Notesnook Desktop 3.3.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33955 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.