$$In October $2013,$ Adobe said hackers had stolen nearly $3$ million encrypted customer credit card records, as well as login data for an undetermined number of Adobe user accounts. In addition to the credit card records$$ tens of millions of user accounts across various Adobe online properties may have been compromised in the break$-$in$.$ a$.$ In your opinion, which vulnerability could have led to user$$s accounts being compromised on the part of cloud consumers? $(5)$