| Component | n8n |
| Severity | critical (CVSS 9.1) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L |
| Published (NVD) | 2026-06-22 |
| Last modified | 2026-06-24 |
| Affected versions | n8n < 2.20.0 n8n < 2.20.0 |
| Fixed in | 2.20.0 |
| Weakness | CWE-918 |
| CISA KEV | not listed |
NVD description
n8n before 2.20.0 contains a credential exfiltration vulnerability in the POST /rest/dynamic-node-parameters/options endpoint that allows authenticated users to bypass Allowed HTTP Request Domains restrictions. Attackers with credential access can cause the n8n server to issue HTTP requests with credentials to unauthorized hosts, exfiltrating sensitive authentication data.
What to do
- Upgrade n8n to
2.20.0or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-56348
- https://github.com/n8n-io/n8n/security/advisories/GHSA-3875-8gcx-7v46
- https://www.vulncheck.com/advisories/n8n-credential-exfiltration-via-allowed-http-request-domains-bypass-in-dynamic-node-parameters-endpoint
Read more
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