npm · n8n
n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution
The legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions. Successful exploitation grants the attacker host-level code execution as the n8n process.
The legacy expression engine is the default engine in affected versions.
The issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1. Users should upgrade to one of these versions or later to remediate the vulnerability.
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
N8N_EXPRESSION_ENGINE=vm.These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
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Check my repoSources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.