The 31 papers presented in this volume were carefully reviewed and selected from 52 submissions. They stem from the following workshops: – AIHWS: 3rd ACNS Workshop on Artificial Intelligence in Hardware Security – AIoTS: 4th ACNS Workshop on Artificial Intelligence and Industrial IoT Security – CIMSS: 2nd ACNS Workshop on Critical Infrastructure and Manufacturing System Security – Cloud S&P: 4th ACNS Workshop on Cloud Security and Privacy – SecMT: 3rd ACNS Workshop on Security in Mobile Technologies – SiMLA: 4th ACNS Workshop on Security in Machine Learning and its Applications