Victims use social support seeking (SSS) to buffer the negative effects of cyberbullying. It is unknown whether cybervictims' perceptions of harm and having poor peer and parental relationships influence SSS. Using a sample of 451 cyberbullying-victims, aged 12-18, 68% girls, this study examined relationships of gender, harm, peer rejection, parental attachment, offline victimisation and online aggression to SSS, and tested the interaction of harm with peer rejection and parental attachment. Findings from logistic regression revealed that poor parental attachment and higher peer rejection decreased SSS, and that the association between parental attachment and SSS was stronger among cyber-victims with higher harm. This study highlights the importance of assessing cyber-victims' attachment and experiences with their peers when implementing preventative intervention programs.