HackingTechnologyInformationCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)MediumContained

MASTEC, INC.

bd_b14ee6c6db7a5726 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 23, 2026

Filed

Jun 5, 2026

To disclose

6 weeks

Affected · nationwide

25,22011 in this filing

Linked

9 filings

Confidence

65%

Full breach record for MASTEC, INC. →2 incidents on file

MasTec, Inc. reported an external system breach (hacking) occurring on August 9, 2025, discovered on April 23, 2026. The incident affected 25,220 individuals, including 11 Maine residents. Notification was sent on June 5, 2026, offering identity theft protection services via CyEx Financial Shield. The breach involved unauthorized access to external systems.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d6 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 257 days

discovery → filing · 6 weeks / 43 days

Aug 9, 2025

Begins

Apr 23, 2026

Discovered

Jun 5, 2026

Filed

vs. sector median

13 wks faster

This filing is one of 9 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitecl0pbd_077ee15e6166ed792025-10-31 · +216dVerified by operator

Regulatory filings (7) · sorted by filing gap

Vermont State AGbd_17006039c927389d2026-06-05Verified
Indiana State AGbd_2337a1feed74d7a42026-06-05Verified
Nebraska State AGbd_69df7fd6f827f7472026-06-05Verified
South Carolina State AGbd_d93b0d10e9a7baae2026-06-05Verified

Show 3 more filings ↓up to 4d gap

New Hampshire State AGbd_9a55bbe733ae71cb2026-06-04 · +1dCandidate
Texas State AGbd_2db96186099527c32026-06-09 · +4dVerified
Massachusetts State AGbd_fa5d678c3d2160372026-06-09 · +4dVerified

Name: Shook, Hardy & Bacon L.L.P.
norm: shook hardy bacon

Name: MASTEC, INC.
norm: mastec
Domain: mastec.com
Industry: Technologyllm

Discovered: Apr 23, 2026
Breach occurred: Aug 9, 2025
Undetected for: 257 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 5, 2026
Affected individuals: 25,220state + nationwide
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Sent written notification to affected individuals
Offered identity theft protection services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(43 days from discovery to filing)
Compliance flags: Leak >180dME AG >30d · 43d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Apr 23, 2026
→ Filed with AG: Jun 5, 2026
43d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Apr 23, 2026 → Filed with AG: Jun 5, 2026	43d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 8 states

View merged incident ↗

New Hampshire State AGJun 4 · first

Vermont State AG+1d

Indiana State AG+1d

Nebraska State AG+1d

South Carolina State AG+1d

Maine State AG+1d · this page

Texas State AG+5d

Massachusetts State AG+5d

Pattern: first filing Jun 4 (NH), last Jun 9 (MA) — a 5-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/2bf42d37-96db-467d-a802-1624035c31c9.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 5, 2026
Raw hash: 0b7c51d312aedd42a706b2ca720236fdbc69a39836af105787e3222982cd3756

Linked disclosures

Ransomware claims (1)

Regulatory filings (7) · sorted by filing gap

Reporting entityShook, Hardy & Bacon L.L.P.

Victim entityMASTEC, INC.

Incidentdiscovered Apr 23, 2026

Stated responseSent written notification to affected individuals

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov