@apostrophecms/file pretty-URL Vulnerable to Unauthenticated SSRF via Host header

Summary When prettyUrls: true is enabled on @apostrophecms/file a documented SEO feature for serving uploaded files at clean URLs, the public pretty-URL handler builds the upstream URL using the raw Host HTTP request header: js proxyUrl = $req.protocol://$req.get'host'$uglyUrl That URL is then...