Apple is urging iPhone and iPad users to promptly update their operating systems to fix security bugs that may have already been exploited by hackers. The latest update (14.4) was released on January 26. Don’t wait to install this update.

On its support webpage, the company said three security flaws “may have been actively exploited.” It did not reveal too many specifics about the bugs, noting “Apple does not disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available.” The issue is a link in an exploit chain, meaning a hacker would need to exploit further bugs for it to be fully executable.