diff --git a/www/api/ccsr.php b/www/api/ccsr.php
index e81c738..a4ec71e 100644
--- a/www/api/ccsr.php
+++ b/www/api/ccsr.php
@@ -59,6 +59,12 @@
 		$codesign = 1;
 
 	$CSR = trim($_REQUEST['optionalCSR']);
+	
+	if (($weakKey = checkWeakKeyCSR($CSR)) !== "")
+	{
+		die("403, $weakKey");
+	}
+	
 	$incsr = tempnam("/tmp", "ccsrIn");
 	$checkedcsr = tempnam("/tmp", "ccsrOut");
 	$fp = fopen($incsr, "w");