HackingEnergy & UtilitiesUtilitiesVulnerability ExploitCustomer Data InvolvedPIIHighContained

EVERSOURCE ENERGY

bd_867123e23f9768f0 · schema v1 · pii pii-v1

Severity

High

Discovered

Apr 27, 2026

Filed

May 21, 2026

To disclose

24 days

Affected · nationwide

3,0491 in this filing

Linked

5 filings

Confidence

66%

Full breach record for EVERSOURCE ENERGY →2 incidents on file

Eversource Energy reported an external system breach (hacking) occurring on April 14, 2026, discovered on April 27, 2026. The incident affected 3,049 individuals, including 1 Maine resident. The breach involved the acquisition of personal identifiers, including government IDs. Eversource provided written notification and offered 24 months of identity protection services through IDX.

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Maine clockDiscovered Apr 27, 2026 → Filed with AG May 21, 202624d ✓ ME AG ≤30d24 days 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 · 13 days

discovery → filing · 24 days

Apr 14, 2026

Begins

Apr 27, 2026

Discovered

May 21, 2026

Filed

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Massachusetts State AGbd_160d257e6f33cfda2026-05-21Candidate
Vermont State AGbd_b78e35812ecebc502026-05-21Verified
New Hampshire State AGbd_c5622f9e262c68882026-05-21Verified
Indiana State AGbd_c4e9a718e30760472026-05-27 · +6dVerified

Name: EVERSOURCE ENERGY
norm: eversource energy

Name: EVERSOURCE ENERGY
norm: eversource energy
Industry: Energy & Utilitiesllm

Discovered: Apr 27, 2026
Breach occurred: Apr 14, 2026
Undetected for: 13 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 3,049state + nationwide
Data types: Government IDIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: Filed data breach notice with Maine Attorney General
Initial access: exploit_public_facing

During the incident: Sent written notification to affected consumers
Offered 24 months of Identity Guard services from IDX
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 24 days(24 days from discovery to filing)
Compliance flags: ME AG ≤30d · 24d
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 27, 2026
→ Filed with AG: May 21, 2026
24d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Apr 27, 2026 → Filed with AG: May 21, 2026	24d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Massachusetts State AGMay 21 · first

Vermont State AGMay 21 · first

New Hampshire State AGMay 21 · first

Maine State AGMay 21 · first · this page

Indiana State AG+6d

Pattern: first filing May 21 (MA), last May 27 (IN) — a 6-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-a1252b4f8318/5a095898-f480-4579-8193-f1f4fc07a451.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 21, 2026
Raw hash: 7866c62ab619d2df7fe6430eb8e7d5748e3655bbb6075e89935b6f6a68c93a09

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityEVERSOURCE ENERGY

Victim entityEVERSOURCE ENERGY

Incidentdiscovered Apr 27, 2026

Stated responseSent written notification to affected consumers

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov