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bdu:2026-06920

EUVD-2026-308471

fkie_cve-2026-42226

n8n is an open source workflow automation platform. Prior to versions 1.123.33 and 2.17.5, the dynamic-node-parameters endpoints did not verify whether the authenticated caller was authorized to use a supplied credential reference. An authenticated user with access to a shared workflow could supply a foreign credential ID in the request body, causing the backend to decrypt and use that credential in a helper execution path where the caller also controls the destination URL. This allowed the caller to force the backend to authenticate against attacker-controlled infrastructure using a credential belonging to another user, effectively exfiltrating a reusable API key. The issue is not limited to any single node type; any node that resolves credentials dynamically through these endpoints may be affected. This issue has been patched in versions 1.123.33, 2.17.5, and 2.18.0.

GHSA-r4v6-9fqc-w5jr — n8n's Credential Authorization Bypass in dynamic-node-parameters Allows Foreign API Key Replay

Affected: npm: n8n

## Impact The `dynamic-node-parameters` endpoints did not verify whether the authenticated caller was authorized to use a supplied credential reference. An authenticated user with access to a shared workflow could supply a foreign credential ID in the request body, causing the backend to decrypt and use that credential in a helper execution path where the caller also controls the destination URL. This allowed the caller to force the backend to authenticate against attacker-controlled infrastructure using a credential belonging to another user, effectively exfiltrating a reusable API key.

The issue is not limited to any single node type; any node that resolves credentials dynamically through these endpoints may be affected.

## Patches The issue has been fixed in n8n version 2.18.0. Users should upgrade to this version or later to remediate the vulnerability.

## Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Restrict n8n access to fully trusted users only. - Avoid sharing workflows with users who should not have access to the credentials those workflows reference.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

WID-SEC-W-2026-1251 — n8n: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in n8n ausnutzen, um beliebigen Programmcode auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, SQL-Injection-Angriffe durchzuführen, einen Denial-of-Service-Zustand verursachen, Cross-Site-Scripting-Angriffe durchzuführen, Benutzer auf bösartige Websites umzuleiten oder Sitzungen zu kapern.