Roman Catholic Archdiocese of St John
qilinThis record tracks a ransomware attack claimed by the qilin group against Roman Catholic Archdiocese of St John. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAPWindow Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.
Attack Summary
The organization Roman Catholic Archdiocese of St John appears on the qilin ransomware leak site. It operates in the Education sector and is estimated to employ around 101-1000 people. The affected entity is based in Canada. The incident was first observed on April 21, 2026. Breach House tracks this attack from public ransomware leak-site postings for threat-intelligence purposes.
Leak Screenshots
SAMPLEProof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.