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GHSA-mxrg-77hm-89hv

n8n: Prototype Pollution in XML and GSuiteAdmin node parameters lead to RCE

Source: GitHub Advisory Database (reviewed) Critical CVE-2026-33696

Packages

EcosystemPackageAffectedFixed in
npm n8n >= 2.14.0, < 2.14.1 2.14.1
npm n8n >= 2.0.0-rc.0, < 2.13.3 2.13.3
npm n8n < 1.123.27 1.123.27

Details

As written in the advisory (Markdown source, shown as plain text).

## 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.

References

External links from the advisory. They lead to third-party sites.