Hey guys i believe my old wordpress site got hacked (db_version 38590) with the following error when trying to login over /wp-admin:
Fatal error: Cannot redeclare get_available_post_mime_types() (previously declared in /www/htdocs/server/sitename.de/wp-includes/post.php:7139) in /www/htdocs/server/sitename.de/wp-admin/includes/post.php on line 1092
The Frontend seemse to work without problem, tho i cant access the backend because of it atm.
I tried to find a new post.php to replace it with but found nothing on the internet since it's quite an old Wordpress version. Is there another way to fix my issue so i can access the backend again? sadly no backups are available