SSRF in N8n
CVE-2026-56348
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (39.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- N8n — versions 0, 2.20.0
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-3875-8gcx-7v46 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/n8n-credential-exfiltration-via-allowed-http-reque… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56348?
- CVE-2026-56348 is a critical-severity vulnerability in N8n, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.1/10. Published 2026-06-22.
- How severe is CVE-2026-56348?
- Critical severity. CVSS v3 base score is 9.1 out of 10.