How an unpatched Microsoft Exchange 0-day likely caused one of the UK’s biggest hacks ever

Evidence appears to show a critical 0-day tracked as ProxyNotShell was exploited.

https://arstechnica.com/security/2023/08/how-an-unpatched-microsoft-exchange-0-day-likely-caused-one-of-the-uks-biggest-hacks-ever/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social