CVE-2026-77076: Generation of Error Message Containing Sensitive Information in n8n-io n8n
Description
n8n versions prior to 1.123.69, 2.33.4, and 2.34.1 have an information disclosure vulnerability in the GraphQL node. When a GraphQL request fails at the connection level, the error message includes sensitive information such as decrypted credential secrets in the request headers. This sensitive data is stored verbatim in the execution engine's run data, accessible to any authenticated user who can read the execution results.
CVSS v4.0
Score 7.1high
Affected software
n8n-io
n8n
n8n-io
n8n
n8n-io
n8n
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-77076 describes an information disclosure vulnerability in n8n's GraphQL node. Specifically, when a GraphQL request fails at the connection level, the node re-throws the underlying HTTP client error without wrapping it in n8n's standard error type. This error contains the live request's headers, which include decrypted credential secrets. These secrets are persisted verbatim in the execution engine's stored run data, allowing any authenticated user with access to execution results to retrieve sensitive credential information.
Potential Impact
The vulnerability allows authenticated users to access decrypted credential secrets by reading stored execution run data. This could lead to unauthorized disclosure of sensitive credentials, potentially compromising integrations or systems connected via n8n workflows. The CVSS 4.0 score of 7.1 indicates a high severity impact due to network attack vector, low attack complexity, and no user interaction required.
Mitigation Recommendations
A fix is available in n8n versions 1.123.69, 2.33.4, and 2.34.1. Users should upgrade to these or later versions to remediate the vulnerability. There is no indication that the vulnerability is mitigated in earlier versions or that no action is required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-20T10:51:39.784Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a86e706acd9273b498befb6
Added to database: 08/20/2026, 11:37:42 UTC
Last enriched: 09/11/2026, 01:47:19 UTC
Last updated: 10/05/2026, 06:48:18 UTC
Views: 68
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