- User account with access to the SaaS password manager was compromised.
- User account with access to the SaaS password manager was compromised.
- User account with access to the SaaS password manager was compromised.
- Password safe file (keepass) was compromised/leaked and its (medium-strength) master password was presumably brute-forced.
EDIT forgot one:
- Password manager was used by a user-facing web backend, which unlocked it with an unscoped read-everything master password. Web backend was hacked, predictable consequences ensued.