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As you know there’s some php functions to be disabled on shared hosting environments. Searching the Google, I found many lists of these functions. one of these functions is curl_exec, I can’t understand why this function should be disabled? How this function could be vulnerable?
It could be used to create a request loop on itself, which would lock the server. It could also be used to impersonate the site or proxy requests. If those are good enough reasons to disable
curl_exex, really depends how much you trust the code.