n8n before 1.123.83 contains an authorization bypass vulnerability that allows authenticated members to spoof workflow identity by supplying a trusted identifier in Execute Sub-workflow inline JSON mode. Attackers can set this identifier to resolve credentials from projects they do not belong to and modify another workflow's static data and error-workflow dispatch.
Authorization Bypass Through User-Controlled Key The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.