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.
- Score
- CVSS 4.0 7.1 High
- Status
- Analyzed - disclosure@vulncheck.com
- Published
- 2026-08-20
- Last modified
- 2026-08-21
- Weaknesses
- CWE-209
Affected products
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-9fqj-7wc5-cwhx
- https://www.vulncheck.com/advisories/n8n-before-credential-leak-via-graphql-node-error
