According to LastPass:
We have determined that an unauthorized party, using information obtained in the August 2022 incident, was able to gain access to certain elements of our customers’ information. Our customers’ passwords remain safely encrypted due to LastPass’s Zero Knowledge architecture.
Not much more info is shared besides that - but here is the official (i.e. "what we want you to know") report:
https://blog.lastpass.com/2022/11/notice-of-recent-security-incident/