2026 WilmerHale — Nov 2025 client PII access; notifications Jul 10; class action filed (Jul)
Data compromised
Client personal information including Social Security numbers per attorney and Bloomberg Law summaries of July 10, 2026 notices—complaint alleges "thousands" of clients; exact field inventory and count pending firm/regulator notice
Technical writeup
Verified client notification with related litigation — July 2026. Wilmer Cutler Pickering Hale and Dorr LLP (WilmerHale) began notifying affected individuals on July 10, 2026 that personal information—including Social Security numbers per consumer-attorney summaries—had been accessed on November 11, 2025. A putative class action filed about July 15, 2026 in the U.S. District Court for the District of Columbia (reported by Bloomberg Law via DataBreaches.net) alleges the Washington-based firm discovered the incident in early May and seeks damages for "thousands" of potentially impacted clients. BreachHistory indexes recordsAffected 0 until an attested victim total appears in a firm notice or AG filing.
Root cause
Unauthorized access to WilmerHale systems affecting client personal information on November 11, 2025 (per firm notifications summarized in litigation reporting); discovered early May 2026 per class-action complaint