CVE-2026-103249
Deferred Deferred - Pending Action

Stored DOM XSS in n8n Workflow Editor via Resource Locator Links

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: VulnCheck

Description
n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a stored DOM cross-site scripting vulnerability in Resource Locator parameter dropdown link handling. Workflow authors can inject malicious script URLs that execute arbitrary JavaScript in the editor origin when other users open the node dropdown and click the external-link icon, with the payload persisting across workflow imports and shares.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-103249
EUVD
EUVD-2026-90643

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
n8n n8n to 1.123.80 (exc)
n8n n8n From 2.0.0 (inc) to 2.39.6 (exc)
n8n n8n From 2.40.0 (inc) to 2.40.1 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a stored DOM-based cross-site scripting (XSS) vulnerability in n8n workflow automation software. It allows a workflow author to inject a malicious script URL into the Resource Locator parameter. When other users open the node dropdown and click an external link icon, the script executes in the editor's origin. The payload persists in the workflow and affects anyone who opens, imports, or shares the workflow.

Detection Guidance

Check n8n version with: n8n --version. Inspect workflows for Resource Locator parameters containing script URLs or unusual external links. Review browser console logs when opening node dropdowns for unexpected JavaScript execution.

Impact Analysis

If you use n8n versions before 1.123.80, 2.39.6, or 2.40.1, an attacker could trick you into executing arbitrary JavaScript by opening a malicious workflow. This could lead to unauthorized actions, data theft, or session hijacking in your n8n instance. The attack requires user interaction but can affect multiple users sharing the same workflow.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data processed by n8n workflows, potentially violating GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations may face compliance breaches if malicious scripts exfiltrate regulated data. Immediate patching and auditing of workflows are recommended to maintain compliance.

Mitigation Strategies

Upgrade n8n to patched versions (>=1.123.80, >=2.39.6, or >=2.40.1). Restrict instance access to trusted users only. Audit existing workflows for suspicious Resource Locator parameters and remove any malicious URLs.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-103249. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart