And if you download the CMS / Board / Blog again from the trusted source, then downloading via FTP your files comparing them ?
Just to make sure none of them have been modified in any unwanted way.
Next step is making a backup of the database with an external tool - Cpanel, phpMyAdmin and so on. If any of these tools isn't installed - just install them temporary for making the backup removing them once finished.
Then check the DB if there's something wrong - Templates as example, Tables etc.
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