Pierce County Library security incident history
Hacking, data breaches and other security incidents involving Pierce County Library, with related coverage.
Incidents: 1 · Most recent
Pierce County Library cyberattack leaks data of 340,000 people
340KImpact: Personal information of more than 340,000 people
Pierce County Library in Washington state was hit by a cyberattack that leaked personal information. In September 2025, a lawsuit alleging negligence and the exposure of more than 300,000 personal records came to light, and in December the number of victims was put at more than 340,000.
Related reports: 5 · last report →