A public-health clinic laptop with resident vaccination records is left unlocked on a picnic table during an outreach event. Which security pillar is primarily violated?

Confidentiality protects information from unauthorized disclosure. An unlocked laptop displaying or containing vaccination records in a public setting creates a clear path for unintended viewers to access protected personal data. While availability and integrity remain important overall, the primary pillar breached by exposed sensitive records in this scenario is confidentiality.