Cybersecurity firm Okta's stock closes down 11.57% after the company said a hacker accessed its support system using a stolen credential and viewed client files (Rohan Goswami/CNBC)

Rohan Goswami / CNBC:

Cybersecurity firm Okta’s stock closes down 11.57% after the company said a hacker accessed its support system using a stolen credential and viewed client files  —  – Cybersecurity firm Okta said an unidentified hacker had accessed the company’s support system and viewed client files.