Clop ransomware group exploited a zero-day in software developer Ipswitch's MOVEit Managed File Transfer and stole data from over 100 organisations beginning on 27 May 2023

Unknown hackers compromised email accounts of city of Philadelphia during May to July 2023

Unknown hackers gained access to a limited number of computer systems at Bunker Hill Community College (BHCC) in Boston, Massachusetts, in May 2023

Unknown ransomware group disrupted the network of Thomas Hardye School in Dorchester, UK, on 21 May 2023

BlackByte ransomware group attacked US city of Augusta in May 2023

Unknown ransomware group caused data loss in across Sri Lankan government offices beginning on 17 May 2023