CVE-2026-103246

Deferred Deferred - Pending Action

BaseFortify

Publication date: 2026-10-01

Last updated on: 2026-10-06

Assigner: VulnCheck

Description

n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership during inline agent node-tool introspection. Attackers can reference arbitrary credential IDs to decrypt and exfiltrate plaintext secrets to attacker-controlled hosts without ownership verification.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-01

Last Modified

2026-10-06

Generated

2026-10-19

AI Q&A

2026-10-01

EPSS Evaluated

2026-10-18

NVD

CVE-2026-103246

EUVD

EUVD-2026-90750

Affected Vendors & Products

Vendor	Product	Version / Range
n8n-io	n8n	0
n8n-io	n8n	2.40.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-639	The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

Executive Summary

This vulnerability affects n8n versions before 2.39.6 and 2.40.0 before 2.40.1. It allows attackers to reference arbitrary credential IDs without verifying ownership. This enables decryption and exfiltration of plaintext secrets to attacker-controlled hosts.

Detection Guidance

Check n8n version with 'n8n --version' or inspect package.json for version. Look for unexpected credential references in workflow exports or URLs. Monitor network traffic for plaintext secret exfiltration to external hosts.

Impact Analysis

Attackers could access and decrypt any instance credential, including those of the instance owner, even if they are an ordinary member. Plaintext secrets may be sent to external hosts. The vulnerability has a high severity rating with significant confidentiality impact.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Unauthorized decryption and exfiltration of plaintext secrets may result in non-compliance with these regulations due to unauthorized data exposure.

Mitigation Strategies

Upgrade n8n to versions 2.39.6 or 2.40.1 or later immediately. Restrict instance access to trusted users only. Rotate all exposed credentials. Audit workflows for unexpected credential references and remove them.

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