Users are unable to attach images in osTicket v1.18.3 -- file upload returns 400 Bad Request on ajax.php/form/upload/ticket/index.php.
Apply the patch from the official osTicket pull request: https://github.com/osTicket/osTicket/pull/6932
Originally sourced from forum.osticket.com . osFAQ.org summarises community knowledge for quick reference.
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