OpenEMR before 8.5.0 contains a persistent SQL injection vulnerability in SLEOB::slInvoiceNumber(), where the CLP01 claim control number from uploaded X12 835 ERA files is concatenated unescaped into a query. Attackers with billing write access can upload a crafted .edi file via sl_eob_search.php that is stored on the server and re-executes a time-based payload whenever it is reprocessed through sl_eob_process.php, extracting patient health information.