Colorado health care giant UCHealth on Friday warned its patients, employees and providers to be vigilant about any activity involving their personal information following a data breach involving one of its vendors. Health system officials said that Diligent provides online hosted services for UCHealth, and its software was accessed and attachments downloaded by the cybercriminal. The downloaded documents may have included names, addresses, dates of birth and treatment-related information. Social Security numbers and other information may have been accessed “in very limited cases,” according to UCHealth.