Microsoft source code taken by Lapsus$ through one account — confirmed
@vxunderground relayed the Bing and Cortana source dump on March 22, 2022. Microsoft confirmed “a single account” was compromised.
Leaked on 22 March 2022
At 02:43 UTC on March 22, 2022, @vxunderground posted that Lapsus$ had released partial source code for Bing, Bing Maps and Cortana.
Later that day Microsoft confirmed that a single account had been compromised, giving limited access, and said no customer code or data was involved, according to The Verge. TechCrunch also reported the confirmation.
Confirmed. Leakly does not link the dump.