MasTec
Data Breach on October 29, 2025
| Data Breach Report | |||
|---|---|---|---|
| Victim | mastec.com | ||
| Threat Actor | 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 |
Credential Exposure for mastec.com
We've indexed 1,598 @mastec.com accounts from external breaches, plus 312 credentials for mastec.com itself.
Last checked Aug 13, 2026
| @mastec.com addresses from external breaches | |
|---|---|
| Third-party breaches | 1,380 accounts · across 189 breaches · 1,190 with a plaintext password · most recent Feb 7, 2026 |
| Combo lists | 648 accounts · most recent Aug 8, 2026 |
| Passwords for mastec.com accounts | |
|---|---|
| Combo lists | 292 logins · most recent Aug 8, 2026 |
| Infostealer logs | 60 logins · 41 infected devices · most recent Aug 7, 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.
Is your organization next?
MasTec was breached. Check if your company's credentials have been exposed in this or other data breaches.
Check your exposure →Continuous dark web monitoring alerts you when we find leaked credentials or session tokens for your company.