HackingProfessional ServicesProfessional ServicesData ExfiltratedCustomer Data InvolvedGovernment IDFinancial accountIdentity (basic)MediumContained

Castaglia, LLP

bd_54af497dfcbf72cb · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 26, 2026

Filed

Apr 28, 2026

To disclose

5 weeks

Affected · nationwide

3011 in this filing

Linked

4 filings

Confidence

66%

Full breach record for Castaglia, LLP →

Castaglia, LLP reported an external system breach (hacking) occurring between Feb 28 and Mar 8, 2026. The firm discovered the incident on Mar 26, 2026, determining that files containing names, SSNs, driver's licenses, and financial account numbers were accessed. 301 individuals were affected, including 1 Maine resident. Notification was sent on Apr 28, 2026, offering one year of credit monitoring via Kroll.

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Maine clockDiscovered Mar 26, 2026 → Filed with AG Apr 28, 202633d ⏱ ME AG >30d5 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 · 26 days

discovery → filing · 5 weeks / 33 days

Feb 28, 2026

Begins

Mar 26, 2026

Discovered

Apr 28, 2026

Filed

vs. sector median

13 wks faster

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

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Massachusetts State AGbd_4d1d7f895e14bb102026-04-28Candidate
Vermont State AGbd_9f6d12a16e64ce782026-04-28Verified
Nebraska State AGbd_e8afd09a3424c18c2026-04-28Verified

Name: Castaglia, LLP
norm: castaglia

Name: Castaglia, LLP
norm: castaglia
Industry: Professional Servicesllm

Discovered: Mar 26, 2026
Breach occurred: Feb 28, 2026 – Mar 8, 2026
Undetected for: 26 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 28, 2026
Affected individuals: 301state + nationwide
Data types: Government IDFinancial accountIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Reported the incident to law enforcement
Initial access: exploit_public_facing

During the incident: Took action to contain it
Began an investigation
Reported the incident to law enforcement
Established a dedicated, toll-free call center
Offered credit monitoring through Kroll
Changes made: Taken, and will continue to take, steps to enhance the security of its computer network
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(33 days from discovery to filing)
Compliance flags: ME AG >30d · 33d
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: Mar 26, 2026
→ Filed with AG: Apr 28, 2026
33d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Mar 26, 2026 → Filed with AG: Apr 28, 2026	33d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Massachusetts State AGApr 28 · first

Vermont State AGApr 28 · first

Nebraska State AGApr 28 · first

Maine State AGApr 28 · 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.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/5b334f62-85ea-4e3d-8b39-4f1a5d49ab47.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 28, 2026
Raw hash: 7b7af61aab3fe36254b25f5fc533ebcda684df0af57c670de6ab7ff3f2fedac9

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityCastaglia, LLP

Victim entityCastaglia, LLP

Incidentdiscovered Mar 26, 2026

Stated responseTook action to contain it

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov