On Friday, many Facebook users from the US and Europe reported that they were automatically logged out in the middle of sessions and failed to access their accounts.
Hackers stole Pfizer-BioNTech COVID-19 vaccine trial data from EMA servers in December and leaked them on online forums, claiming they were defrauding people.
The hackers breached into Microsoft's internal network and used an internal account to view source code but as it had view-only access, they could not alter the codes.
As Donald Trump remained mum on the alleged Russian-backed cyberattacks that compromised national security, Republican and Democrat senators have called retaliation.