Dropbox remains adamant its systems weren't hacked despite hundreds of supposed Dropbox usernames and passwords being posted Monday on a thread on Internet forum site Reddit.

Hundreds of alleged account details showcasing usernames and passwords in plain text were posted on the Reddit thread.

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The hackers reportedly obtained seven million Dropbox accounts, according to a post on Pastebin. The cybercriminals posted some 400 accounts at first, adding they'd post more if the public donated Bitcoins.

Dropbox denied it was hacked, putting the blame for the leak on third-party services.

"Your stuff is safe," Anton Mityagin, a member of the company's security team, wrote in a blog post. "The usernames and passwords referenced in these articles were stolen from unrelated services, not Dropbox."

He added the hackers used the stolen user data and tried to log into various sites across the Internet, including Dropbox.

"Attacks like these are one of the reasons why we strongly encourage users not to reuse passwords across services," Mityagin said, adding that Dropbox automatically resets passwords when suspicious login activity is detected.

He also said the emails and passwords posted online "are not associated with Dropbox accounts."

The file hosting service also encouraged all its users to change their passwords, as well as allow two-factor authentication that has been used by Dropbox as an added layer of protection for over two years.

Users are required to input an additional security code generated by a mobile authenticator app, or is via SMS to the user's handset.

Meanwhile, another service has been hit by hackers attacking third-party software.

Hackers posted videos and pictures of Snapchat users on forum website 4Chan on Sunday, following through with a threat announced Friday.

Some 13 gigabytes worth of videos and photos from a website called Snapsaved.com were posted in a discussion thread on 4Chan, said The Guardian. The number of the photos with explicit content showing underage users is unclear as of the moment.

By default, Snapchat erases videos and photos received and seen by a viewer. Some users, however, used an app called SnapSave and a now-shuttered website named Snapsaved to access messages outside Snapchat. The victim's use of SnapSave has come back and bitten them in the rear.

In a statement released Saturday on Facebook, the people responsible for creating Snapsaved said the site had been hacked.

TagsDropbox, hack, hacker, internet security, Login credentials, Authenticator, snapchat, Leak, Nude Photo Leaks, 4chan