AI agent vulnerability · n8n

CVE-2026-56348: n8n: Credential exfiltration via Allowed HTTP Request Domains Bypass

mediumCVSS 4.0 5.3 · 3.1 9.1GHSA-3875-8gcx-7v46

Impact The POST /rest/dynamic-node-parameters/options endpoint allowed any authenticated user to cause the n8n server to issue HTTP requests including credentials bypassing the intended restrictions on which hosts could be contacted for that credential (Allowed HTTP Request Domains). The user needed to be authenticated and have access to the credential. Patches The issue has been fixed in n8n version 2.20.0.

Published May 19, 2026 · Updated Jul 20, 2026

Affected packages

n8n

Ecosystem: npm
Affected: < 2.20.0
Fixed in: 2.20.0
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

The POST /rest/dynamic-node-parameters/options endpoint allowed any authenticated user to cause the n8n server to issue HTTP requests including credentials bypassing the intended restrictions on which hosts could be contacted for that credential (Allowed HTTP Request Domains). The user needed to be authenticated and have access to the credential.

Patches

The issue has been fixed in n8n version 2.20.0. 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.
Limit credential sharing to users who genuinely require access to those credentials.

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

Credited to vnth4nhnt.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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