CVE-2026-103249: n8n before 1.123.80, 2.39.6, and 2.40.1 Stored DOM XSS via Resource Locator

Severity: high (CVSS 7.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-01
Weakness: CWE-79

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.

Affected products

n8n-io n8n: before 1.123.80; from 2.0.0 before 2.39.6; from 2.40.0 before 2.40.1 — fixed in 1.123.80, 2.39.6, 2.40.1

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.80, 2.39.6, 2.40.1. Check the vendor advisory for mitigations.

References

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