UK Biobank, a health data repository holding genomic and medical records on approximately 500,000 UK citizens, suffered a data breach that resulted in suspension of external researcher access. The breach maps to improper access control (CWE-284) and potential cloud data exfiltration (T1530), with threat actor attribution and precise attack vector unconfirmed. Relevance to this rollup is limited to organizations that share data with UK Biobank or maintain analogous health and genomic data repositories.