The recently rehabbed Parkland star, 26, broke his jaw on Sunday at his Los Angeles-area home, a source confirms to PEOPLE.
The insider also confirms that Efron, who slipped on a puddle, has his mouth wired shut and received stitches from a gash he suffered. Plans to promote upcoming film That Awkward Moment have been postponed.
Efron seemed in good spirits in the last month, when he celebrated his birthday with some golf in Carlsbad, Calif., and joined Moment costar Michael B. Jordan at a Vanity Fair event.
E! News was the first to report the story. Reporting by JULIE JORDAN