SB20260423155 - Multiple vulnerabilities in n8n

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Main Vulnerability Database SB20260423155

SB20260423155 - Multiple vulnerabilities in n8n

Published: April 23, 2026 Updated: April 30, 2026

Security Bulletin ID SB20260423155
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Cross-site scripting (CVE-ID: N/A)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear


The vulnerability allows a remote user to execute arbitrary script in a victim's browser.

The vulnerability exists due to cross-site scripting in the Form Trigger node's CSS sanitization when processing user-supplied form styling. A remote user can store a crafted XSS payload to execute arbitrary script in a victim's browser.

User interaction is required when a visitor opens the published form. The injected script executes persistently for every visitor of the published form and can hijack form submissions or present phishing content.


2) Cross-site scripting (CVE-ID: N/A)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear


The vulnerability allows a remote user to perform stored cross-site scripting.

The vulnerability exists due to improper neutralization of input during web page generation in the Form Node description field when rendering form content. A remote user can configure a form node with a crafted HTML description to perform stored cross-site scripting.

User interaction is required when an end user visits the form.


3) Open redirect (CVE-ID: N/A)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to redirect end users to an arbitrary external URL.

The vulnerability exists due to an overly permissive iframe sandbox policy in the Form Node when rendering form content. A remote user can configure a crafted form to redirect end users to an arbitrary external URL.

User interaction is required when an end user visits the form.


Remediation

Install update from vendor's website.

References