The Export All URLs WordPress plugin before 5.1 generates CSV filenames containing posts URLS (including private posts) in a predictable pattern using a random 6-digit number. These files are stored in the publicly accessible wp-content/uploads/ directory. As a result, any unauthenticated user can brute-force the filenames to gain access to sensitive data contained within the exported files.
Rack's improper unfolding of folded multipart headers preserves CRLF in parsed parameter values