n8n Missing Token Validation Vulnerability (CVE-2026-54308) — High Severity

Understanding the n8n Missing Token Validation Vulnerability

n8n is a popular open-source platform designed to automate workflows, helping users connect various apps and services. A critical security vulnerability, identified as CVE-2026-54308, has been discovered within n8n. This flaw affects specific “trigger” nodes, namely the MicrosoftAgent365Trigger and StripeTrigger. Essentially, these nodes did not properly check the authenticity of incoming requests. This means that an attacker, without needing to be authenticated and if they knew the unique webhook URL, could send fabricated data to your workflows. This could potentially lead to your automated processes executing with data controlled by the attacker, compromising the integrity of your operations.

CVE Details

• Product Name: n8n
• Published Date: June 23, 2026
• Severity: HIGH
• Status: Analyzed

Affected Products

This vulnerability specifically impacts instances of n8n running versions prior to 2.25.7 and 2.26.2. If your n8n deployment is on any version older than these, it is vulnerable to this security flaw.

Current Status

The vulnerability has been thoroughly analyzed and understood by the n8n development team. Patches addressing this issue have already been released, providing a straightforward path to remediation for affected users.

Severity Level

CVE-2026-54308 has been classified as a HIGH severity vulnerability. This rating is due to its exploitability: an unauthenticated attacker can trigger the flaw remotely without requiring any special user privileges or user interaction. Successful exploitation could result in unauthorized access to sensitive data and manipulation of workflow processes, leading to significant impacts on confidentiality and data integrity.

Possible Solutions

Protecting your n8n environment from CVE-2026-54308 is crucial, and thankfully, a direct fix is available:

• Immediate Upgrade: The most effective solution is to update your n8n installation to version 2.25.7, 2.26.2, or any subsequent release. These versions contain the necessary security patches to resolve the vulnerability.
• Temporary Mitigations (If Immediate Upgrade Isn’t Possible):
  • Deactivate Vulnerable Workflows: As a short-term measure, consider temporarily deactivating any workflows that utilize the MicrosoftAgent365Trigger node or the StripeTrigger node.
  • Restrict Network Access: Implement network-level restrictions to limit access to your n8n webhook endpoints. Ideally, only allow connections from trusted IP addresses or internal networks.

It is important to remember that these workarounds offer only partial protection and should be replaced with the official software upgrade as soon as possible.

References

• https://github.com/n8n-io/n8n/security/advisories/GHSA-jvc7-762p-3743