CVE-2026-126467: OpenEMR before 8.5.0 contains a mass assignment vulnerability in ObservationController::processEnhancedFormSave() that allows authenticated low-privilege users

OpenEMR before 8.5.0 contains a mass assignment vulnerability in ObservationController::processEnhancedFormSave() that allows authenticated low-privilege users to forge authorization flags through an incomplete field blacklist. Attackers can submit authorized=1 or override the id field alongside observation_id to mark observations as Provider-signed and overwrite clinical fields of other observations within the same patient encounter.