CVE-2026-103251
Deferred Deferred - Pending Action

Authentication Bypass in n8n Queue Mode Package Installation

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 validation bypass vulnerability in the community package installation handler for queue mode deployments. Attackers with Redis write access can bypass name validation, permission checks, checksum verification, and npm safety checks to install arbitrary npm packages across all cluster instances without authentication.

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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-2026-103251
EUVD
EUVD-2026-90645

Affected Vendors & Products

Showing 5 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)
n8n n8n to 2.39.6 (exc)
n8n n8n to 2.40.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

This vulnerability affects n8n, an open-source workflow automation tool, in versions before 1.123.80, 2.39.6, and 2.40.1. It allows attackers with write access to a Redis instance used for scaling to bypass package installation validation checks. This enables them to install arbitrary npm packages across all cluster instances without authentication or permission checks.

Detection Guidance

To detect this vulnerability, check if your n8n instance is running a vulnerable version (before 1.123.80, 2.39.6, or 2.40.1). Inspect Redis write access permissions and monitor for unauthorized package installations. Review n8n logs for suspicious community package installation attempts.

Impact Analysis

An attacker could exploit this to install malicious packages on your n8n instance, potentially leading to data breaches, system compromise, or unauthorized access to sensitive workflows and data. The impact includes loss of confidentiality, integrity, and availability of the system.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations using affected n8n versions may face legal and regulatory penalties due to compromised data integrity and confidentiality.

Mitigation Strategies

Immediately upgrade n8n to patched versions (1.123.80+, 2.39.6+, or 2.40.1+). Restrict Redis write access to trusted users only. Disable community package installation if not required. Audit installed packages and restrict instance access to trusted users.

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