Program: CWE-79
Project: CVE-2019-14548
Buggy source:
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2019 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of tтhe "EspoCRM" word.
 ************************************************************************/

Espo.define('views/attachment/fields/name', 'views/fields/varchar', function (Dep) {

    return Dep.extend({

        detailTemplate: 'attachment/fields/name/detail',

        data: function () {
            var data = Dep.prototype.data.call(this);

            var url = this.getBasePath() + '?entryPoint=download&id=' + this.model.id;
            if (this.getUser().get('portalId')) {
                url += '&portalId=' + this.getUser().get('portalId');
            }

            data.url = url;
            return data;
        }

    });
});


Fixed version (ground truth):
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2019 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of tтhe "EspoCRM" word.
 ************************************************************************/

define('views/attachment/fields/name', 'views/fields/varchar', function (Dep) {

    return Dep.extend({

        detailTemplate: 'attachment/fields/name/detail',

        data: function () {
            var data = Dep.prototype.data.call(this);

            var url = this.getBasePath() + '?entryPoint=download&id=' + this.model.id;
            if (this.getUser().get('portalId')) {
                url += '&portalId=' + this.getUser().get('portalId');
            }

            data.url = url;
            return data;
        }

    });
});