wanglongcn ltcms API Endpoint downloadUrl server-side request forgery

A vulnerability was found in wanglongcn ltcms 1.0.20. It has been declared as critical. Affected by this vulnerability is the function downloadUrl of the file /api/file/downloadUrl of the component API Endpoint. The manipulation of the argument file leads to server-side request forgery. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.