Shaken by allegations of sexual wrongdoing at St. John’s Seminary in Brighton, the Archdiocese of Boston released an independent report Friday that confirmed instances of inappropriate sexual activity and found that social drinking was frequently encouraged.

The year-long review, led by former Massachusetts US attorney Donald K. Stern and the Boston law firm Yurko, Salvesen & Remz, was prompted by two former seminarians who alleged in social media posts that their religious studies had been tarnished by an atmosphere of heavy drinking, sexual harassment, and bullying.

Investigators concluded that the seminary was not “a den of sexual misconduct fueled by excessive drinking,’’ but that it lacked strong leadership, solid financial controls, and tolerance for dissent.