I think this is the most significant data breach this year! The supply-chain/3rd party style breach likely exposed billions of mobile text messages and 2FA security codes, giving attackers the ability to gain selective access to very sensitive systems and data.
SEC filing where Syniverse discloses the breach: https://www.sec.gov/Archives/edgar/data/1839175/000119312521284329/d234831dprem14a.htm
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