The effects of child sexual abuse (CSA) have been found to surpass generations as maternal history of CSA is associated with increased difficulties in sexually abused children. However, little is known about the mechanisms underlying this association. The present study aimed to test maternal mental health symptoms including psychological distress, post-traumatic stress disorder (PTSD) symptoms, and dissociation as mediators of the relationship between maternal CSA and children’s internalizing, externalizing, and dissociation symptoms in a large sample of sexually abused children. A total of 997 sexually abused children aged 3-14 years old and their mothers were recruited at five specialized intervention centers offering services to sexually abused children and their families. The children were divided into two groups depending on their mothers’ self-reported history of CSA. Mothers completed a series of questionnaires assessing their mental health and children’s functioning. Maternal history of CSA was associated with increased maternal psychological distress, PTSD symptoms, and dissociation following children’s disclosure of CSA. In turn, maternal psychological distress and maternal dissociation were associated with increased child internalizing, externalizing, and dissociation symptoms. Maternal PTSD symptoms were associated with child internalizing symptoms. Maternal mental health difficulties mediated the association between maternal CSA and sexually abused children’s maladaptive outcomes. Clinicians should assess for possible history of CSA in mothers of sexually abused children and determine how best to support them to cope with the aftermaths of their child’s disclosure and with their own traumatic past.