An attachment injury can occur when one partner violates the assumption that they will provide comfort and caring during a moment of increased need. For injured partners, unresolved attachment injuries can underlie an enduring stress reaction and lower relationship satisfaction. However, no research has examined the associations between the perceived severity of the injury and sexual satisfaction, a central component of relationship well-being. In this cross-sectional study, we examined the direct and indirect associations between the perceived severity of the attachment injury and sexual satisfaction via injury-related stress symptoms and levels of forgiveness, in injured partners. A total of 145 adults who reported having experienced an attachment injury in their current relationship completed self-report questionnaires measuring injury severity, event-related stress, forgiveness, and sexual satisfaction. An indirect association between the perceived severity of the attachment injury and sexual satisfaction through higher injury-related stress and lower forgiveness was found via a path analysis. Results suggest that fostering forgiveness and attending to injury-related stress may be key toward sexual satisfaction in couples where a partner reports an attachment injury. Clinical implications of these results are discussed in light of theory and potential treatment strategies for addressing an attachment injury in couple's therapy.