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Critical severity · published Jun 22, 2026
CVE-2026-56348
n8n - Credential Exfiltration via Allowed HTTP Request Domains Bypass in Dynamic Node Parameters Endpoint
9.9
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N8
n8n · n8n
before 2.20.0 · source: vendor, NVD
Affected product
N8
n8n
n8n
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56348
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56348
Vendor Advisory
https://github.com/n8n-io/n8n/security/advisories/GHSA-3875-8gcx-7v46
Third Party Advisory
https://www.vulncheck.com/advisories/n8n-credential-exfiltration-via-allowed-http-request-domains-bypass-in-dynamic-node-parameters-endpoint
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