French police arrest suspected hacker behind dozens of data breaches

**Executive summary:** French authorities arrested a 20-year-old alleged hacker known as HexDex who is linked to roughly 100 website breaches across public institutions, sports federations, and private entities; stolen data was reportedly posted to cybercrime marketplaces and included a March breach of the Ministry of National Education’s Compas database exposing personal data for about 243,000 employees, with forensic analysis and an ongoing investigation underway.