The company confirmed via their own blog stating,"Our investigation found that usernames and passwords recently stolen from other websites were used to sign in to a small number of Dropbox accounts. We've contacted these users and have helped them protect their accounts."
Users first noticed the issue last month, posting on Dropbox's web forum saying they received spam from email addresses only associated with Dropbox. Dropbox started investigating the issue when 295 people had already posted regarding the problem. Most of the posts were from users of Germany, Holland and the U.K.
As for the spam, the company stated that one of these stolen passwords allowed someone to access a project document in a Dropbox employee's folder that contained multiple user email addresses. And that this particular access led to spamming.
Dropbox has now beefed up its security by putting additional controls in place:
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