CVE-2026-103249: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in n8n-io n8n
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.
AI Analysis
Technical Summary
CVE-2026-103249 is a stored DOM XSS vulnerability in n8n affecting specific version ranges: >=0 <1.123.80, >=2.0.0 <2.39.6, and >=2.40.0 <2.40.1. The vulnerability arises from improper neutralization of input during web page generation in the Resource Locator parameter dropdown link handling. Workflow authors can embed malicious script URLs that execute arbitrary JavaScript in the context of the editor when other users interact with the external-link icon in the node dropdown. The payload remains persistent through workflow imports and sharing, increasing the risk of exploitation.
Potential Impact
Successful exploitation allows arbitrary JavaScript execution in the editor origin of n8n users who open the affected node dropdown and click the external-link icon. This can lead to potential unauthorized actions within the editor context. The vulnerability requires user interaction (clicking the external-link icon) and privileges to author workflows. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
A fix is available in n8n versions 1.123.80, 2.39.6, and 2.40.1 and later. Users should upgrade to these fixed versions to remediate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-103249: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in n8n-io n8n
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 v4.0
Score 6.9medium
Affected software
n8n-io
n8n
pkg:npm/n8n-io/n8nRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103249 is a stored DOM XSS vulnerability in n8n affecting specific version ranges: >=0 <1.123.80, >=2.0.0 <2.39.6, and >=2.40.0 <2.40.1. The vulnerability arises from improper neutralization of input during web page generation in the Resource Locator parameter dropdown link handling. Workflow authors can embed malicious script URLs that execute arbitrary JavaScript in the context of the editor when other users interact with the external-link icon in the node dropdown. The payload remains persistent through workflow imports and sharing, increasing the risk of exploitation.
Potential Impact
Successful exploitation allows arbitrary JavaScript execution in the editor origin of n8n users who open the affected node dropdown and click the external-link icon. This can lead to potential unauthorized actions within the editor context. The vulnerability requires user interaction (clicking the external-link icon) and privileges to author workflows. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
A fix is available in n8n versions 1.123.80, 2.39.6, and 2.40.1 and later. Users should upgrade to these fixed versions to remediate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-30T10:52:32.249Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abe7492a43b0b3b89bd1cdf
Added to database: 10/01/2026, 14:56:18 UTC
Last enriched: 10/01/2026, 15:21:58 UTC
Last updated: 10/02/2026, 00:54:24 UTC
Views: 4
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