Serverless architecture empowers organizations to build and deploy software at scale without in-house servers. The prevalence of Function-as-a-Service (FaaS) models like microservices is a testament to the popularity of serverless architecture. Understanding and monitoring these points is the key to effective serverless security. The most common risks for serverless architectures come from event-data injections. The cost implications of a major security breach far outweigh the relatively low-cost expenditure of protecting yourself from them.
Source: https://www.helpnetsecurity.com/2021/03/09/keeping-your-serverless-architecture-secure/