CVE-2026-77076

n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain an information disclosure vulnerability in the GraphQL node. When a GraphQL request fails at the connection level, the node re-throws the underlying HTTP client error unchanged instead of wrapping it in n8n's standard error type. That error contains the live request's headers, including a decrypted credential secret, which the execution engine persists verbatim. Any authenticated user able to read the resulting execution can retrieve the decrypted credential secret from the stored run data.

• CWE-209

• https://github.com/n8n-io/n8n/security/advisories/GHSA-9fqj-7wc5-cwhxMitigation, Vendor Advisory
• https://www.vulncheck.com/advisories/n8n-before-credential-leak-via-graphql-node-errorThird Party Advisory

Published

Aug 20, 2026

Last Modified

Sep 1, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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