The ISSA 2018 workshop received 10 submissions from which 3 full papers and 1 short paper were accepted. They cover topics such as software security engineering, domain-specific security and privacy architectures, and automative security. In addition, an invited paper on safety and security co-engineering intertwining is included. The CSITS 2018 workshop received 9 submissions from which 5 full papers and 1 short paper were accepted. The selected papers deal with car security and aviation security.