Threat actors are using public exploits for a critical authentication bypass flaw in ProjectSend to upload webshells and gain remote access to servers. [...]
source https://www.bleepingcomputer.com/news/security/hackers-exploit-projectsend-flaw-to-backdoor-exposed-servers/
source https://www.bleepingcomputer.com/news/security/hackers-exploit-projectsend-flaw-to-backdoor-exposed-servers/