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idk if it will. it’s not adding scripting to documents(which already exists), it’s allowing a webpage that you’ve opened, that is already running code, embed a libreoffice document and control it.
unless you’re uploading your documents to a webpage and it’s stealing them or something of that form, I don’t think there’s much if any new security threat
4 to 5 added like 2 tags, but was fully backwards compatibile. the painful upgrade you’re thinking of was 3 to 4 where they basically rewrote, it but don’t have any tutorial content other than one of the main devs making an absurdly long series of walkthrough videos so it’s impossible to find the topic you’re interested in