MasTec
Data breach claim reported October 29, 2025
| Data Breach Report | |||
|---|---|---|---|
| Victim | mastec.com | ||
| Claimed By | CL0P | ||
| Date Discovered | Oct 29, 2025 | ||
| Description | MasTec, Inc. is an infrastructure construction company based in the USA, providing engineering, installation, and maintenance services for energy, utility, communications, and renewable infrastructure. | ||
| Leak Size | Unknown |
Breach claims on this page are published by threat actors and haven't been verified by Breachsense.
Credential Exposure for mastec.com
We've indexed 1,622 @mastec.com accounts from external breaches, plus 388 credentials for mastec.com itself.
Last checked Nov 8, 2026
| @mastec.com addresses from external breaches | |
|---|---|
| Third-party breaches | 1,380 accounts · across 190 breaches · 1,190 with a plaintext password · most recent Oct 6, 2026 |
| Combo lists | 694 accounts · most recent Nov 8, 2026 |
| Passwords for mastec.com accounts | |
|---|---|
| Combo lists | 367 logins · most recent Nov 8, 2026 |
| Infostealer logs | 67 logins · 43 infected devices · most recent Nov 8, 2026 |
Logins may belong to customers or to staff, and the data doesn't say which. None of this is necessarily connected to the ransomware attack above.
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