Eilonc-Pillar

**Name of the Vulnerable Software and Affected Versions** n8n versions prior to 2.10.1 n8n versions prior to 2.9.3 n8n versions prior to 1.123.22 **Description** A second-order expression injection issue exists in the Form nodes of this open source workflow automation platform. An unauthenticated attacker can inject and evaluate arbitrary expressions by submitting crafted form data. This occurs when a form node interpolates a value provided by an unauthenticated user and the field value begins with an `=` character, triggering a double-evaluation of the content. While the injection is initially limited to data within the expression context, it can escalate to remote code execution on the host if chained with an expression sandbox escape. Exploitation requires a specific workflow configuration where user input is reflected back, such as on a confirmation page. **Recommendations** Upgrade to version 2.10.1 or later. Upgrade to version 2.9.3 or later. Upgrade to version 1.123.22 or later. Review the usage of form nodes manually to ensure no fields prefix user-provided values with an `=` character. Disable the Form node by adding `n8n-nodes-base.form` to the `NODES EXCLUDE` environment variable. Disable the Form Trigger node by adding `n8n-nodes-base.formTrigger` to the `NODES EXCLUDE` environment variable.

**Name of the Vulnerable Software and Affected Versions** n8n versions prior to 1.123.17 n8n versions prior to 2.5.2 **Description** n8n is an open-source workflow automation platform. An authenticated user with permission to create or modify workflows can exploit crafted expressions in workflow parameters to trigger system command execution on the host running n8n. This allows for potential full server compromise, including the theft of API keys, credentials, and secrets. The issue stems from an expression escape vulnerability and incomplete AST-based sanitization. Public exploits are available. **Recommendations** Upgrade to n8n version 1.123.17 or later. Upgrade to n8n version 2.5.2 or later. As a temporary workaround, limit workflow creation and editing permissions to fully trusted users only. Deploy n8n in a hardened environment with restricted operating system privileges and network access.