Cognizant Technology Solutions US Corporation experienced a data breach around April 21, 2026. The incident involved a ransomware attack by the group CoinbaseCartel, which claimed to have obtained company data and posted about it on the dark web on April 15, 2026. Cognizant disclosed the breach to the Massachusetts Attorney General on August 18, 2026. The breach exposed sensitive personal information, specifically Social Security numbers. Reports also indicate names, dates of birth, addresses, and government IDs were involved. Medical and financial information may also have been involved, but the exact scope of these data types is not fully confirmed. The number of affected individuals is not publicly visible in the accessible snippets. While written notices were sent to affected individuals, the specific number of individuals notified has not been publicly disclosed. Details regarding the full scope of the breach may emerge later.