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BreachesJun 4, 2026

🚨🇲🇽 A threat actor known as Masterbyte is selling a dataset allegedly tied to Hyundai Steel Me...

Masterbyte threat actor sells alleged 53GB dataset from Hyundai Steel Mexico subsidiary.

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Summary

A threat actor known as Masterbyte is offering a dataset allegedly stolen from Hyundai Steel Mexico, the Mexican subsidiary of South Korea's Hyundai Steel. The claimed breach involves approximately 53 GB of data across 67,000 files spanning from 2018 onwards. The incident appears to target a major automotive supply chain entity based in Pesquería, Nuevo León, Mexico.

Entities

Hyundai Steel (vendor)Masterbyte (threat_actor)