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.

Scoring

Severity

HIGH

CVSS base score

7.1

CVSS vector

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

EPSS probability

0.29%

CWE

CWE-209

Published

2026-08-20

Last modified

2026-08-21

Affected products

• n8n-io n8n
• n8n-io n8n
• n8n-io n8n
• n8n-io n8n
• n8n-io n8n
• n8n-io n8n

Weakness type

• CWE-209

Related vulnerabilities

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• CVE-2026-69294 — Microsoft COM for Windows Information Disclosure Vulnerability
• CVE-2026-68886 — Windows Network Connection Broker Information Disclosure Vulnerability
• CVE-2026-67383 — Microsoft SQL Server Information Disclosure Vulnerability
• CVE-2026-69684 — Windows Error Reporting Information Disclosure Vulnerability
• CVE-2026-69552 — Windows Print Spooler Components Information Disclosure Vulnerability
• CVE-2026-11873 — Pki-core: dogtag-pki: empty request to dogtag /ca/rest/certrequests causes http 500, java exception, and stacktrace disclosure
• CVE-2026-82739 — Ash.Resource.Validation.Confirm leaks a confirmed field's stored value in the atomic mismatch error

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