MaxKB RCE vulnerability in function library

MaxKB, which stands for Max Knowledge Base, is an open source knowledge base question-answering system based on a large language model and retrieval-augmented generation (RAG). Prior to version 1.9.0, a remote command execution vulnerability exists in the module of function library. The vulnerability allow privileged‌ users to execute OS command in custom scripts. The vulnerability has been fixed in v1.9.0.