PROVIDENCE, R.I. (WPRI) -- Rhode Island's state government has suffered a major cyberattack involving the private data of a significant number of residents who have applied for health insurance or other social services over the last eight years, Target 12 has confirmed. Gov. Dan McKee's office said the hackers accessed RIBridges, the online portal for obtaining social services such as SNAP and Medicaid benefits, as well as health insurance through HealthSourceRI. There is a "high probability" that the personal information of an undisclosed number of people -- including Social Security and bank account numbers -- has been stolen, officials said. The apparent hacker sent a screenshot on Dec. 10 that showed file folders from the RIBridges system, confirming the security breach. A malicious code was later discovered in the system, as well. It's unclear if the hacker has demanded a ransom. McKee and other state officials have called a 7:30 p.m. news conference at the R.I. Department of Administration to brief the public about the cyberattack. 12 News will air the governor's news conference live on air on WPRI 12 and online at WPRI.com. "To the best of our knowledge, any individual who has received or applied for health coverage and/or health and human services programs or benefits could be impacted by this leak," the governor's office said in a statement. Those state programs include Medicaid, the Supplemental Nutrition Assistance Program (SNAP), Temporary Assistance for Needy Families (TANF), the Child Care Assistance Program (CCAP), HealthSource RI health insurance, Rhode Island Works (RIW), Long-Term Services and Supports (LTSS), and the General Public Assistance (GPA) program. "We understand this is an alarming situation," the governor's office said, adding that future updates will be posted at the website admin.ri.gov/ribridges-alert. The governor's office said Deloitte, the private company the state has paid to develop and maintain RIBridges, first warned the state of a potential cyberattack on Dec. 5 and confirmed a "major security threat" on Friday. By early Friday evening, the state had shut down the HealthyRhode website that residents use to access programs maintained by RIBridges. State and Deloitte officials had spent the days since Dec. 5 examining the scope of the problem and how many people might be affected, according to the governor's office, which said it was kept quiet until now "for security reasons." Law enforcement agencies were notified immediately, his office said. RIBridges was created as part of the Unified Health Infrastructure Project, or UHIP, whose development and launch was a major debacle for state government during the administration of former Gov. Gina Raimondo. Raimondo's administration spent years in disputes with Deloitte -- which had been paid hundreds of millions of dollars to build UHIP -- for fixes and refunds on the system. In 2021, Gov. Dan McKee agreed to a three-year contract extension for Deloitte valued at $99 million. This is a breaking news story and will be updated. Ted Nesi ([email protected]) is a Target 12 investigative reporter and 12 News politics/business editor. He co-hosts Newsmakers and writes Nesi's Notes on Saturdays. Connect with him on Twitter, Bluesky and Facebook. Eli Sherman ([email protected]) is a Target 12 investigative reporter for 12 News. Connect with him on Twitter and on Facebook. Tim White and Alexandra Leslie contributed to this report.