Data Breaches Affect Over 300,000 Individuals in Healthcare Sector

Mid-South Pulmonary & Sleep Specialists (MSPSS) and Medical Computer Business Services (MCBS) reported data security incidents affecting over 300,000 individuals. MSPSS discovered unauthorized activity on November 2, 2025, leading to potential exposure of protected health information (PHI). MCBS identified unauthorized access on September 25, 2025, with an external group claiming responsibility for the breach. The incidents involved unauthorized access to sensitive personal data, including Social Security numbers and medical records. MSPSS completed its review by May 18, 2026, while MCBS finalized its investigation by May 28, 2026. Both organizations have notified affected individuals and advised them to monitor their accounts for suspicious activity. MSPSS has implemented additional security measures, while MCBS reported no evidence of misuse of the compromised data.

Key Points: • MSPSS and MCBS reported data breaches affecting over 300,000 individuals. • Unauthorized access to sensitive personal data, including PHI, was confirmed. • MCBS was targeted by the Pear ransomware group, which claimed responsibility for the attack.