Menlo ParkA Muse user could have reached Meta’s sensitive internal databases.
Meta engineers found the flaws in the weeks before launch, and the issue reached Mark Zuckerberg.
Each Muse instance runs in a kernel-based virtual machine, and an escape lets code reach the host system.
Pre-launch security pushes are not unusual, but outside researchers have found other Muse security issues since launch.
A Meta source says many senior engineers consider a massive data breach inevitable.
Sources: 404 Media