CVE-2026-56348 | THREATINT

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.

PUBLISHED Reserved 2026-06-20 | Published 2026-06-22 | Updated 2026-06-23 | Assigner VulnCheck

MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:L/SA:L

CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

Problem types

Server-Side Request Forgery (SSRF)

Product status

Default status

unaffected

Any version before 2.20.0

affected

2.20.0 (semver)

unaffected

Credits

vnth4nhnt reporter

References

github.com/...io/n8n/security/advisories/GHSA-3875-8gcx-7v46 (GitHub Security Advisory (GHSA-3875-8gcx-7v46)) vendor-advisory

www.vulncheck.com/...ass-in-dynamic-node-parameters-endpoint (VulnCheck Advisory: n8n - Credential Exfiltration via Allowed HTTP Request Domains Bypass in Dynamic Node Parameters Endpoint) third-party-advisory

cve.org (CVE-2026-56348)

nvd.nist.gov (CVE-2026-56348)

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