HackingProfessional ServicesProfessional ServicesData ExfiltratedEmployee Data InvolvedIdentity (basic)Government IDFinancial accountEmploymentMediumContained

Stoss Landscape Urbanism

bd_c04db5d13c273423 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Oct 10, 2025

Filed

Jan 9, 2026

To disclose

13 weeks

Affected

28state residents only

Linked

4 filings

Confidence

64%

Full breach record for Stoss Landscape Urbanism →

Stoss Landscape Urbanism discovered unauthorized access to its network on October 10, 2025. The investigation determined that an unauthorized third party gained access on or about September 14, 2025, and exfiltrated files containing employee personal information, including names, Social Security numbers, bank information, passport information, and employment records. The company engaged external cybersecurity experts, notified law enforcement, and is offering 24 months of identity monitoring services to affected individuals.

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Massachusetts clock✗ MA AG >90d13 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 26 days

discovery → filing · 13 weeks / 91 days

Sep 14, 2025

Begins

Oct 10, 2025

Discovered

Jan 9, 2026

Filed

vs. sector median

5 wks faster

This filing is one of 4 about the same incident.View merged incident

A leak claim by akira about this victim predates this filing by 91 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Siteakirabd_3b7db16247e535c52025-11-19 · +51dVerified by operator
Leak Siteakirabd_c9608e607f7aec392025-10-10 · +91dVerified by operator

Regulatory filings (1) · sorted by filing gap

Maine State AGbd_41659a1b5e2aac212026-01-09Verified by operator

Name: Stoss Landscape Urbanism
norm: stoss landscape urbanism
Domain: stoss.net

Name: Stoss Landscape Urbanism
norm: stoss landscape urbanism
Domain: stoss.net
Industry: Professional Servicesllm

Discovered: Oct 10, 2025
Breach occurred: Sep 14, 2025
Undetected for: 26 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 28state-resident count only
Data types: Identity (basic)Government IDFinancial accountEmployment
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External

During the incident: Launched an investigation with the support of external cybersecurity experts
Reported the incident to law enforcement
Implemented a number of safeguards across our systems to enhance our security
Offering complimentary access to Experian IdentityWorks for 24 months
Changes made: Examining what additional steps we can take to prevent something like this from happening again
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 weeks(91 days from discovery to filing)
Compliance flags: MA AG >90dLeak >90dLeak >30d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Maine State AGJan 9 · first

Massachusetts State AGJan 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/2026-34-stoss-landscape-urbanism/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 9, 2026
Raw hash: ea75126965252202c468e82834bf934bf313c9ff860110481c1203af46f9172d

Linked disclosures

Ransomware claims (2)

Regulatory filings (1) · sorted by filing gap

Reporting entityStoss Landscape Urbanism

Victim entityStoss Landscape Urbanism

Incidentdiscovered Oct 10, 2025

Stated responseLaunched an investigation with the support of external cybersecurity experts

ComplianceMA AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov