Authentication Bypass in n8n Workflow Automation

Compliance Impact

This vulnerability allows an attacker to exfiltrate data to external services and persistently take over integrations by hijacking OAuth credentials. Such unauthorized access and data exfiltration can lead to violations of data protection regulations like GDPR and HIPAA, which mandate strict controls over personal and sensitive data access and processing.

The ability to enumerate credential details and overwrite or revoke tokens without proper authorization undermines confidentiality and integrity requirements commonly enforced by these standards.

Therefore, if exploited, this vulnerability could result in non-compliance with regulations that require safeguarding user data and ensuring only authorized access to sensitive workflows and credentials.

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Executive Summary

CVE-2026-54305 is a high-severity vulnerability in the n8n workflow automation platform affecting versions prior to 1.123.55, 2.25.7, and 2.26.2. It involves three Enterprise Edition (EE) endpoints used by the Dynamic Credentials feature that did not properly enforce ownership or scope checks on authenticated sessions.

This flaw allowed an authenticated user, even without project membership or credential sharing, to enumerate credential identifiers, names, and types from any private workflow. The attacker could also initiate OAuth authorization flows to overwrite another user's stored tokens with tokens they control or revoke another user's credential tokens entirely.

Exploiting this vulnerability enables attackers to execute workflows under their own OAuth identity, potentially leading to data exfiltration to attacker-controlled external services and persistent takeover of integrations. Token revocation could also break affected workflows.

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Impact Analysis

This vulnerability can have serious impacts including unauthorized access to sensitive credential information and the ability for attackers to hijack workflows by executing them under their own OAuth identity.

Attackers could exfiltrate data to external services they control, leading to potential data breaches. They could also persistently take over integrations, compromising the integrity and confidentiality of your workflows.

Additionally, attackers can revoke credential tokens, which would disrupt or break workflows relying on those credentials, causing operational issues.

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Detection Guidance

This vulnerability involves unauthorized access to Dynamic Credentials EE endpoints in n8n, allowing enumeration and manipulation of credential tokens. Detection would involve monitoring for unusual OAuth authorization flows, unexpected token overwrites, or revocation activities on credentials without proper project membership or sharing relationships.

Since the vulnerability exploits authenticated sessions without proper ownership checks, commands or logs to check for suspicious API calls to the three Dynamic Credentials EE endpoints or unusual OAuth token activities could help detect exploitation attempts.

However, no specific detection commands or scripts are provided in the available resources.

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Mitigation Strategies

To mitigate this vulnerability immediately, upgrade n8n to one of the patched versions: 1.123.55, 2.25.7, or 2.26.2.

If upgrading is not immediately possible, temporary mitigations include restricting access to the n8n instance to trusted users only or disabling the Dynamic Credentials feature if it is not required.

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