Server-side request forgery (SSRF) vulnerability exists in a-blog cms Ver.3.1.x series versions prior to Ver.3.1.12 and Ver.3.0.x series versions prior to Ver.3.0.32. If this vulnerability is exploited, a user with an administrator or higher privilege who can log in to the product may obtain arbitrary files on the server and information on the internal server that is not disclosed to the public.