🏛️Massachusetts State AGlinked via multistate filing link · 100%
Clustered 5 filings across 5 jurisdictions · filing window Jun 1, 2026 → Jun 5, 2026. View entity profile → Other incidents for this victim →
incident inc_d27493c7b8704576 · merge_method deterministic · confidence 100%
Discovered → first regulatory filing
Range of discovered_at dates across filings
Time between earliest and latest filing
Not recorded for this incident
Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.
Identity (basic) · Government ID · Financial account
IN MA NH SC VT
all State AG
per-filing reported counts
State AGs report only their own residents; bars show per-filing counts.
Earliest sighting first · deep chronology in Litigation Timeline
Aug 1, 2025 → Aug 31, 2025
When the intrusion reportedly occurred, per the linked filings
Oct 1, 2025
Reported by MASSACHUSETTS AG, NEW HAMPSHIRE AG, SOUTH CAROLINA AG filings
About this clustering
DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.
MasTec, Inc. disclosed a data breach in Massachusetts (filing 2026-932) affecting at least 73 Rhode Island residents, with notifications sent to individuals in multiple states. The incident occurred in August 2025, involving unauthorized access to a portion of the network. Personal information was accessed, and MasTec offered credit monitoring services.
Affected (this filing): 73
MasTec, Inc. notified the New Hampshire Attorney General of a security event affecting 18 NH residents (and 73 RI residents) involving unauthorized access via a zero-day vulnerability in a third-party solution. The incident occurred in August 2025, was detected in October 2025, and involved the exfiltration of names, SSNs, financial account details, and credentials. MasTec applied patches, engaged forensic experts, and mailed notices on June 5, 2026, offering credit monitoring.
Affected (this filing): 18
MasTec, Inc. reported a data breach to the Vermont Attorney General. The breach was reported to the AGO on 2026-06-05. The reporting organization type is Other Commercial. 8 Vermont residents were affected. Categories of data breached: Social Security Numbers, Financial Account Codes, Credit and Debit Account Info.
MasTec Inc reported a data breach to the Indiana Attorney General. The breach occurred on 2025-08-09 and was reported on 2026-06-05. 54 Indiana residents were affected. 25,220 individuals affected in total.
Affected (this filing): 25,220
MasTec, Inc. reported a data security event in South Carolina involving unauthorized access to a portion of its computer network in August 2025. The breach affected personal information of individuals, including 73 Rhode Island residents. MasTec engaged third-party cybersecurity experts and law enforcement, and is offering complimentary credit and identity-theft monitoring services to affected individuals.