Information disclosure in n8n - #VU137159
Published: July 8, 2026
Vulnerability identifier: #VU137159
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper access control in execution data for LLM sub-nodes when storing custom header credential values during workflow runs. A remote user can read execution data to disclose sensitive information.
This issue only affects instances where workflows use LLM sub-nodes with custom headers defined in their credentials. Because execution data can be persisted to the database and exported, exposed values may remain accessible beyond a single execution.
Remediation
Install security update from vendor's website.