New n8n Vulnerability (9.9 CVSS) Lets Authenticated Users Execute System Commands

Cybersecurity researchers have disclosed details of yet another maximum-severity security flaw in n8n, a popular workflow automation platform, that allows an unauthenticated remote attacker to gain complete control over susceptible instances. The vulnerability, tracked as CVE-2026-21858 (CVSS score: 10.0), has been codenamed Ni8mare by Cyera Research Labs. Security researcher Dor Attias has been

Open-source workflow automation platform n8n has warned of a maximum-severity security flaw that, if successfully exploited, could result in authenticated remote code execution (RCE). The vulnerability, which has been assigned the CVE identifier CVE-2026-21877, is rated 10.0 on the CVSS scoring system. "Under certain conditions, an authenticated user may be able to cause untrusted code to be

Last week’s cyber news in 2025 was not about one big incident. It was about many small cracks opening at the same time. Tools people trust every day behave in unexpected ways. Old flaws resurfaced. New ones were used almost immediately. A common theme ran through it all in 2025. Attackers moved faster than fixes. Access meant for work, updates, or support kept getting abused. And damage did not

### Impact A sandbox bypass vulnerability exists in the Python Code Node that uses Pyodide. An authenticated user with permission to create or modify workflows can exploit this vulnerability to execute arbitrary commands on the host system running n8n, using the same privileges as the n8n process. ### Patches In n8n version 1.111.0, a task-runner-based native Python implementation was introduced as an optional feature, providing a more secure isolation model. To enable it, you need to configure the `N8N_RUNNERS_ENABLED` and `N8N_NATIVE_PYTHON_RUNNER` environment variables. This implementation became the default starting with n8n version 2.0.0. ### Workarounds - Disable the Code Node by setting the environment variable `NODES_EXCLUDE: "[\"n8n-nodes-base.code\"]"` ([Docs)](https://docs.n8n.io/hosting/securing/blocking-nodes/) - Disable Python support in the Code node by setting the environment variable `N8N_PYTHON_ENABLED=false`, which was introduced in n8n version 1.104.0. - Config...

A critical security vulnerability has been disclosed in the n8n workflow automation platform that, if successfully exploited, could result in arbitrary code execution under certain circumstances. The vulnerability, tracked as CVE-2025-68613, carries a CVSS score of 9.9 out of a maximum of 10.0. The package has about 57,000 weekly downloads, according to statistics on npm. "Under certain

### Impact n8n contains a critical Remote Code Execution (RCE) vulnerability in its workflow expression evaluation system. Under certain conditions, expressions supplied by authenticated users during workflow configuration may be evaluated in an execution context that is not sufficiently isolated from the underlying runtime. An authenticated attacker could abuse this behavior to execute arbitrary code with the privileges of the n8n process. Successful exploitation may lead to full compromise of the affected instance, including unauthorized access to sensitive data, modification of workflows, and execution of system-level operations. ### Patches This issue has been fixed in **n8n v1.122.0**. Users are strongly advised to upgrade to version **1.122.0 or later**, which introduces additional safeguards to restrict expression evaluation. ### Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Limit workflow creation...