wanglongcn ltcms API Endpoint multiDownload server-side request forgery

A vulnerability was found in wanglongcn ltcms 1.0.20. It has been classified as critical. Affected is the function multiDownload of the file /api/file/multiDownload of the component API Endpoint. The manipulation of the argument file leads to server-side request forgery. It is possible to launch the attack 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.