baserCMS is a Content Management system. Prior to version 4.7.5, any file may be uploaded on the management system of baserCMS. Version 4.7.5 contains a patch.
https://github.com/baserproject/basercms/security/advisories/GHSA-mfvg-qwcw-qvc8
https://github.com/baserproject/basercms/releases/tag/basercms-4.7.5
https://github.com/baserproject/basercms/commit/9297629983ed908c7f51bf61a0231dde91404ebd
https://github.com/baserproject/basercms/commit/922025a98b0e697ab78f6a785a004e0729aa9100