Pingvin Share is a self-hosted file sharing platform and an alternative for WeTransfer. This vulnerability allows an authenticated or unauthenticated (if anonymous shares are allowed) user to overwrite arbitrary files on the server, including sensitive system files, via HTTP POST requests. The issue has been patched in version 1.4.0.
https://github.com/stonith404/pingvin-share/security/advisories/GHSA-rjwx-p44f-mcrv
https://github.com/stonith404/pingvin-share/commit/c52ec7192080c402bd804e69be93dd88cc7c5c70
https://github.com/stonith404/pingvin-share/commit/6cf5c66fe2eda1e0a525edf7440d047fe2f0e35b