Teachers in many countries are mandated by law, professional codes, or education authorities to report child abuse and neglect, including child sexual abuse. However, teachers may not receive adequate preparation for such sensitive interventions, as preservice teacher education degrees provide very few or no compulsory courses on child protection and crucially related, lifelong health and well-being issues. So, where do preservice teachers source their information regarding the mandatory reporting of such abuse? This research examines preservice teachers’ professional university education for their sources of information about mandatory reporting and child sexual abuse. A sample cohort of 56 final 4th-year university bachelor of education (primary school) student teachers in Australia identified the sources they used regarding 10 important aspects of child protection. The results suggest that most did not learn about mandatory reporting or child sexual abuse, and others cited sparse and sporadic public media as their primary information source. These findings, building on previous evidence about inadequate or nonexistent preservice mandatory intervention courses in primary teacher education, may guide the design of appropriate training responses enhancing educational professionals’ knowledge, competencies, skills, and efficacies as mandatory reporters of child sexual abuse.