Index: src/wp-includes/class-wp-xmlrpc-server.php
===================================================================
--- src/wp-includes/class-wp-xmlrpc-server.php	(revision 36763)
+++ src/wp-includes/class-wp-xmlrpc-server.php	(working copy)
@@ -198,6 +198,42 @@
 	}
 
 	/**
+	 * Check if the XML-RPC is enabled before calling the method.
+	 *
+	 * @since 4.5.0
+	 * @access public
+	 */
+	public function call( $methodname, $args ) {
+		if ( 'pingback.' != substr( $methodname, 0, 9) ) {
+			/*
+			 * Respect old get_option() filters left for back-compat when the 'enable_xmlrpc'
+			 * option was deprecated in 3.5.0. Use the 'xmlrpc_enabled' hook instead.
+			 */
+			$enabled = apply_filters( 'pre_option_enable_xmlrpc', false );
+			if ( false === $enabled ) {
+				$enabled = apply_filters( 'option_enable_xmlrpc', true );
+			}
+
+			/**
+			 * Filter whether XML-RPC is enabled.
+			 *
+			 * This is the proper filter for turning off XML-RPC.
+			 *
+			 * @since 3.5.0
+			 *
+			 * @param bool $enabled Whether XML-RPC is enabled. Default true.
+			 */
+			$enabled = apply_filters( 'xmlrpc_enabled', $enabled );
+
+			if ( ! $enabled ) {
+				return new IXR_Error( 405, sprintf( __( 'XML-RPC services are disabled on this site.' ) ) );
+			}
+		}
+
+		return parent::call( $methodname, $args );
+	}
+
+	/**
 	 * Test XMLRPC API by saying, "Hello!" to client.
 	 *
 	 * @since 1.5.0
@@ -237,31 +273,6 @@
 	 * @return WP_User|bool WP_User object if authentication passed, false otherwise
 	 */
 	public function login( $username, $password ) {
-		/*
-		 * Respect old get_option() filters left for back-compat when the 'enable_xmlrpc'
-		 * option was deprecated in 3.5.0. Use the 'xmlrpc_enabled' hook instead.
-		 */
-		$enabled = apply_filters( 'pre_option_enable_xmlrpc', false );
-		if ( false === $enabled ) {
-			$enabled = apply_filters( 'option_enable_xmlrpc', true );
-		}
-
-		/**
-		 * Filter whether XML-RPC is enabled.
-		 *
-		 * This is the proper filter for turning off XML-RPC.
-		 *
-		 * @since 3.5.0
-		 *
-		 * @param bool $enabled Whether XML-RPC is enabled. Default true.
-		 */
-		$enabled = apply_filters( 'xmlrpc_enabled', $enabled );
-
-		if ( ! $enabled ) {
-			$this->error = new IXR_Error( 405, sprintf( __( 'XML-RPC services are disabled on this site.' ) ) );
-			return false;
-		}
-
 		if ( $this->auth_failed ) {
 			$user = new WP_Error( 'login_prevented' );
 		} else {