n8n-io/n8n · error · ExpressionError

Cannot access "${key}" due to security concerns

Error message

Cannot access "${key}" due to security concerns

What it means

Error "Cannot access "${key}" due to security concerns" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/expression-runtime/src/runtime/safe-globals.ts:157

	'__defineGetter__',
	'__defineSetter__',
	'__lookupGetter__',
	'__lookupSetter__',
	'toString',
	'valueOf',
	'toLocaleString',
	'hasOwnProperty',
	'isPrototypeOf',
	'propertyIsEnumerable',
]);

export function __sanitize(value: unknown): unknown {
	// Symbols are not string-coercible and fall outside the denylist; pass through.
	if (typeof value === 'symbol') return value;
	// Coerce once and return the string so the caller uses the already-checked key.
	const key = String(value);
	if (unsafeObjectProperties.has(key)) {
		throw new ExpressionError(`Cannot access "${key}" due to security concerns`);
	}
	return key;
}

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/expression-runtime/src/runtime/safe-globals.ts:157 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/0192a90bb4e3060f. Report an issue: GitHub.