ShokoServer is a media server which specializes in organizing anime. In affected versions the /api/Image/WithPath endpoint is accessible without authentication and is supposed to return default server images. The endpoint accepts the parameter serverImagePath, which is not sanitized in any way before being passed to System.IO.File.OpenRead, which results in an arbitrary file read.
View the template here CVE-2023-43662.yaml
References:
https://nvd.nist.gov/vuln/detail/CVE-2023-43662