What are the security problems (Potential or Existing) for Cloud-Based Computing?

Literature Review: –
Only tutors with writing skills take this. This is a very important assignment for 125 points so I need quality paper
Requirements:- 
Atleast 5 Reference Articles
– Articles should only be from academic journals
– Should only write in APA
– Paper should be 4-5 pages (that should be 1500 words) , double spaced, not including the title page, abstract, or reference list.
– No plagiarism accepted
Question: –
What are the security problems (Potential or Existing) for Cloud-Based Computing?