Unrestricted Upload of File with Dangerous Type in GitHub repository fossbilling/fossbilling prior to 0.5.3.
https://huntr.dev/bounties/043bd900-ac78-44d2-a340-84ddd0bc4a1d
https://github.com/fossbilling/fossbilling/commit/2ddb7438ee0d05f9a9d01555edcfed820960f114