Cybersecurity experts are sounding the alarm about a critical vulnerability discovered in n8n, an open-source workflow automation platform widely used by developers and organizations around the world. The flaw, which affects all versions of n8n, could allow attackers to log in as users from another issuer, effectively bypassing authentication controls.
The issue lies in how n8n handles tokens exchanged between different issuers, a process known as token swapping or introspection. In a normal scenario, when a user logs in to an application using OAuth 2.0, their identity is verified by the authorization server, which issues a unique token that grants access to the requested resources. However, if an attacker can obtain this token and exchange it for another issuer’s token, they would effectively gain unauthorized access to the targeted system.
The vulnerability was discovered through a collaborative effort between cybersecurity researchers at Synopsys Cybersecurity Research and n8n’s development team. After being notified of the issue, n8n released a patch to mitigate the problem, but experts warn that affected users may still be at risk if they haven’t applied the update yet. The company has also taken steps to address the root cause of the vulnerability by rearchitecting its token handling mechanism.
The impact of this flaw is significant, as many organizations rely on n8n for automating various workflows and integrating with other systems. If exploited, the vulnerability could allow attackers to gain access to sensitive data or disrupt business operations. Furthermore, the fact that AI-powered security tools were instrumental in discovering this issue highlights the growing importance of machine learning-based threat detection in modern cybersecurity.
While n8n’s token swapping mechanism may seem complex and esoteric, it’s essential for users to understand how their systems are vulnerable. In practical terms, affected organizations should immediately apply the patch released by n8n or take alternative measures to prevent unauthorized access. This includes enabling multi-factor authentication (MFA), monitoring system logs for suspicious activity, and regularly reviewing user permissions.
In conclusion, the recent discovery of a critical vulnerability in n8n serves as a reminder that even widely used platforms can be flawed, and it’s crucial for users to stay vigilant and proactive when it comes to cybersecurity. By prioritizing patch updates, implementing robust security controls, and staying informed about emerging threats, organizations can minimize their risk exposure and protect against potential attacks.
Source: The Hacker News — 2026-07-16