Is this vulnerability remotely exploitable?

Yes. An attacker who can get a victim to open a malicious note (for example via shared content, compromised account, or crafted backup) can trigger the stored XSS. In the Electron Desktop application with permissive settings, this can lead to remote code execution on the victim's machine.

What level of access does an attacker need to exploit this issue?

The attacker needs a way to influence the content of a note header that will later be displayed in the note history comparison viewer or to supply a crafted backup that the victim imports. No direct local-system access is required; exploitation can occur once the malicious content is processed by the vulnerable viewer in a logged-in session.

What is the safest general fix pattern for this class of vulnerability?

The safest pattern is to eliminate direct HTML injection and treat all user-controlled content as untrusted data. Render it using text-based components or through a strict sanitization and encoding pipeline, and ensure that the desktop runtime (e.g., Electron) does not expose powerful APIs to web content by default.

Severity:

HIGH RISK

(8.6)

Stored Cross-Site Scripting to RCE (CWE-79) in Notesnook Note History Viewer

CVE-2026-33955

Published:

Mar 27, 2026

Status:

Modified

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-94

Impact:

Remote Code Execution via XSS in Electron Desktop Application

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-94

Impact:

Remote Code Execution via XSS in Electron Desktop Application

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Stored Cross-Site Scripting to RCE (CWE-79) in Notesnook Note History Viewer

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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