CVE-2026-59254: n8n - External Secrets Disclosure via Workflow Node Expressions

Severity: medium (CVSS 6.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-15 · updated 2026-10-29
Weakness: CWE-639

Description

n8n before 2.28.1 contains an information disclosure vulnerability where external secrets are incorrectly resolved in workflow node expressions outside credentials scope. Authenticated project editors can read plaintext external secret values by referencing them in node expressions without requiring explicit secrets access permissions.

Affected products

n8n-io n8n: from 2.28.0 before 2.28.1 — fixed in 2.28.1

How to fix

Upgrade to a fixed version: n8n-io n8n 2.28.1. Check the vendor advisory for mitigations.

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-2434-3x6q-8r99
https://www.vulncheck.com/advisories/n8n-external-secrets-disclosure-via-workflow-node-expressions

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