Core file modified. Hacked?

Just installed the Wordfence plugin and was alerted to the following issues:

WordPress core file modified: wp-includes/version.php

The Original Version of the file The Modified Version on your WordPress system
33 * @global string $required_mysql_version 33 * @global string $required_mysql_version
34 */ 34 */
35 $required_mysql_version = ‘5.0’; 35 $required_mysql_version = ‘5.0’;
36 36 $wp_local_package = ”;

WordPress core file modified: wp-admin/includes/upgrade.php

The Original Version of the file The Modified Version on your WordPress system
294 https://wordpress.org/ 294 https://wordpress.org/
295 “), $blog_url, $name, $password, $login_url ); 295 “), $blog_url, $name, $password, $login_url );
296 296
297 @wp_mail($email, __(‘New WordPress Site’), $message); 297 //@wp_mail($email, __(‘New WordPress Site’), $message);
298 } 298 }
299 endif; 299 endif;
300 300
… …
2221 dbDelta( $ms_queries ); 2221 dbDelta( $ms_queries );
2222 } 2222 }
2223 endif; 2223 endif;

Not sure what to do. Please help!

https://wordpress.org/plugins/wordfence/