HOUSTON–Plaintiffs are being sought for a potential class action lawsuit over a data breach at yet another credit union, in this case MemberSource CU.
According to a breach notification filed with the California Attorney General’s office, the $206-million MemberSource CU experienced a data breach in early June of 2026, exposing sensitive personal and financial information belonging to its approximately 15,000 members, although the exact number of members involved has not been disclosed.
“Approximately two weeks after the breach occurred, on June 17, 2025, a ransomware group known as Safepay publicly claimed responsibility for the breach,” according to ClaimDepotcom. “The group posted its claimed on the dark web that it had obtained 50 GB of data from the credit union.”
The types of personal information exposed in the breach included names, Social Security numbers, driver’s license or state identification numbers and financial account information, the report stated.
Notification Letters Sent
MemberSource Credit Union sent notification letters to individuals whose information may have been affected by the ransomware attack, ClaimDepot stated, noting the CU is offering affected individuals with detailed guidance about the steps they can take to help protect their personal information. The notice explained how consumers can place fraud alerts and credit freezes with the three major credit reporting bureaus: TransUnion, Experian and Equifax.
As the CU Daily has reported, numerous credit unions have reported data breaches in recent months, including Frontwave Credit Union, Georgia Heritage Financial CU, Alaska Air Group FCU, and others.
