CVE-2026-59254Medium▾ Sunlitn8n: External Secrets Accessible via Workflow Expressions Outside Credentials
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 22.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.3%
0.3% → 0.4%
External secrets were incorrectly resolved in workflow node expressions, where they are not intended to be available. An authenticated user with project editor access could read the plaintext value of external secrets by referencing them in a node expression, without needing explicit secrets access permissions.
This issue only affects instances with the external secrets feature configured.
The issue has been fixed in n8n versions 2.27.4 and 2.28.1. Users should upgrade to one of these versions or later to remediate the vulnerability.
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
n8n >= 2.28.0, < 2.28.1n8n < 2.27.4Upgrade to a patched release:
n8n 2.28.1n8n 2.27.4Connected by shared product, vendor, weakness, or advisory.
CVE-2026-59209Highn8n: Shared Credential Header Leak via HTTP Request Pagination Expression
CVE-2026-59206Highn8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
CVE-2026-59207Highn8n: "Allowed HTTP Request Domains" Restriction Bypass via AI Agents MCP Connector
CVE-2026-59259Mediumn8n: External Secrets Permission Bypass via Expression Parser Mismatch
CVE-2026-59253Mediumn8n: Improper Authorization Allows Authenticated Users to Assign Workflows to Folders in Other Projects
GHSA-mwq7-vcmc-cm4qHighDuplicate Advisory: SSO Instance-Role Provisioning Allows Privilege Escalation to Instance Owner