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We run confluence server 7.3.2
The problem right now is that malicious files can be uploaded, so limiting formats would mean a little step for more security.
I'll be attentive for your answer.
I don't think there is a way to restrict attachments without apps. Please see a similar post https://community.atlassian.com/t5/Confluence-questions/Restrict-attachment-file-types/qaq-p/210045