The four-volume set LNCS 14344-14347 constitutes the refereed proceedings of the 28th European Symposium on Research in Computer Security, ESORICS 2023, which took place in The Hague, The Netherlands, during September 25-29, 2023.

The 93 full papers presented in these proceedings were carefully reviewed and selected from 478 submissions. They were organized in topical sections as follows:

Part I: Crypto.

Part II: Network, web and internet, privacy, and remote.

Part III: Attacks, blockchain, and miscellaneous.

Part IV: Machine learning, software and systems security.