Social EngineeringTelecom & MediaTechnologyInformationVishingStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Government IDFinancial accountFinancial credentialsMediumContained

Ericsson Inc.

bd_b8d08f1c8833b8f0 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 28, 2025

Filed

Mar 9, 2026

To disclose

45 weeks

Affected

239state residents only

Linked

8 filings

Confidence

66%

Full breach record for Ericsson Inc. →2 incidents on file

Ericsson Inc notified the Massachusetts Attorney General of a data security incident involving a third-party service provider. On April 28, 2025, the provider discovered a vishing incident targeting an employee. Unauthorized access to data occurred between April 17 and April 22, 2025. Affected data included names, Social Security numbers, and financial account information. Approximately 239 Massachusetts residents were notified on March 9, 2026. Ericsson is offering 24 months of credit monitoring.

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Massachusetts clock✗ MA AG >90d45 weeks discovery → filing

Incident timeline

undetected · 11 days

discovery → filing · 45 weeks / 315 days

Apr 17, 2025

Begins

Apr 28, 2025

Discovered

Mar 9, 2026

Filed

This filing is one of 8 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

Maine State AGbd_1d0da259aa3724972026-03-09Candidate
California State AGbd_3ac020b40fae811c2026-03-09Verified by operator
New Hampshire State AGbd_4b391d16ed54393e2026-03-09Verified
Texas State AGbd_b7aab07b8740f4412026-03-09Verified

Show 3 more filings ↓

Vermont State AGbd_b9339ad22885050f2026-03-09Verified
Nebraska State AGbd_dcb9b2488cc2223a2026-03-09Verified
Indiana State AGbd_f086a2ecb41cecd32026-03-09Verified by operator

Name: Ericsson Inc
norm: ericsson

Name: Ericsson Inc.
norm: ericsson
Domain: ericsson.com
Industry: Telecom & MediallmTechnologyllm

Discovered: Apr 28, 2025
Breach occurred: Apr 17, 2025 – Apr 22, 2025
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 9, 2026
Affected individuals: 239state-resident count only
Data types: Identity (basic)Government IDFinancial accountFinancial credentials
Data elements: Social Security number
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1566 Phishing
Threat actor: External
Regulator citations: Notified the Federal Bureau of Investigation
Third party: via Service provider of Ericsson Inc
Initial access: phishing_link

During the incident: Engaged a team of cybersecurity experts
Implemented a forced password reset
Notified the Federal Bureau of Investigation
Initiated a comprehensive investigation
Implemented additional safeguards and training to its employees
Changes made: Providing access to credit monitoring services for 24 months through IDX
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 45 weeks(315 days from discovery to filing)
Compliance flags: MA AG >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 8 states

View merged incident ↗

Maine State AGMar 9 · first

California State AGMar 9 · first

New Hampshire State AGMar 9 · first

Texas State AGMar 9 · first

Vermont State AGMar 9 · first

Nebraska State AGMar 9 · first

Indiana State AGMar 9 · first

Massachusetts State AGMar 9 · first · this page

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.mass.gov/doc/2026-350-ericsson-inc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 9, 2026
Raw hash: 7cf55be8b9df627fce2b6c0cfa943623150ab5632f2324c479454db35f08f7d2

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityEricsson Inc

Victim entityEricsson Inc.

Incidentdiscovered Apr 28, 2025

Stated responseEngaged a team of cybersecurity experts

ComplianceMA AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov