Recently, SM Entertainment announced plans on taking legal actions on behalf of EXO regarding serious rumors being connected to the controversial Jung Joon Young’s chatroom.

Numerous rumors are circulating around social media in relation to an alleged member of EXO being one of the people behind JJY’s chatroom where series of illegal videos were shared.
Here’s the translated statement of SM Entertainment:
Hello, this is SM Entertainment.
The rumors about our artist [EXO] that are being spread online are groundless rumors, and the expansion of this false information is causing serious damage to the artist and agency.
We therefore announce that we will take strong legal action against those who have engaged in such illegal actions (writing, posting, and spreading false rumors). We will continue to take strong legal action against such malicious rumors and ask you to actively report to us (protect@smtown.com).SM Entertainment via exo.smtown.com
Thank you.

As for Jung Joon Young, he filmed a variety show abroad and has returned to South Korea on March 12 at around 5:30PM KST.
Source: (1)