GHSA-mxrg-77hm-89hv n8n: Prototype Pollution in XML and GSuiteAdmin node parameters lead to RCE

• npm n8n: >= 2.14.0, < 2.14.1 → fixed in 2.14.1 • npm n8n: >= 2.0.0-rc.0, < 2.13.3 → fixed in 2.13.3 • npm n8n: < 1.123.27 → fixed in 1.123.27

Impact An authenticated user with permission to create or modify workflows could exploit a prototype pollution vulnerability in the GSuiteAdmin node. By supplying a crafted parameter as part of node configuration, an attacker could write attacker-controlled values onto `Object.prototype`. An attacker could use this prototype pollution to achieve remote code execution on the n8n instance. Patches The issue has been fixed in n8n versions 2.14.1, 2.13.3, and 1.123.27. Users should upgrade to one of these versions or later to remediate the vulnerability. Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: • Limit workflow creation and editing permissions to fully trusted users only. • Disable the XML node by adding `n8n-nodes-base.xml` to the `NODES_EXCLUDE` environment variable. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.