EMQ X User Enumeration Vulnerability

EMQ X is a fully open source, highly scalable and highly available distributed MQTT messaging agent for IoT, M2M and mobile applications. Suitable for IoT, M2M and mobile applications EMQ programs can handle tens of millions of concurrent clients. EMQ X Dashboard version V3.0.0 contains a user enumeration vulnerability that can be exploited by attackers to determine if a given username is valid.