HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedSupply Chain (3P Vendor)Identity (basic)Government IDFinancial accountHighContained

Orrstown Bank

bd_c06d97bcd6201e96 · schema v1 · pii pii-v1

Severity

High

Discovered

May 21, 2026

Filed

Jun 11, 2026

To disclose

21 days

Affected · nationwide

83,93816 in this filing

Confidence

66%

Full breach record for Orrstown Bank →4 incidents on file

Orrstown Bank reported a third-party data breach involving its advisory services provider, Mercadien, P.C. The incident, occurring on September 17, 2025, and discovered on May 21, 2026, affected approximately 83,938 individuals, including 16 Maine residents. Compromised data included names, dates of birth, SSNs, account numbers, and government IDs. Orrstown Bank notified affected individuals on June 11, 2026, and provided 24 months of credit monitoring via Experian.

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Maine clockDiscovered May 21, 2026 → Filed with AG Jun 11, 202621d ✓ ME AG ≤30d21 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 · 246 days

discovery → filing · 21 days

Sep 17, 2025

Begins

May 21, 2026

Discovered

Jun 11, 2026

Filed

vs. sector median

6 wks faster

Part of Mercadien, P.C. supply-chain incident (2026) — a supply-chain cascade affecting multiple organizations.View cascade →

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed83,938 affectedView incident

Name: Orrstown Bank
norm: orrstown bank
Domain: orrstown.com
Industry: Financial Services

Name: Orrstown Bank
norm: orrstown bank
Domain: orrstown.com
Industry: Financial Services
Industry: Financial Servicesllm

Discovered: May 21, 2026
Breach occurred: Sep 17, 2025
Undetected for: 246 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 11, 2026
Affected individuals: 83,938state + nationwide
Data types: Identity (basic)Government IDFinancial account
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
Third party: via Mercadien, P.C.Service Provider
Initial access: exploit_public_facing

During the incident: Provided notice to affected individuals
Offered 24 months of free credit monitoring through Experian IdentityWorks
Changes made: Provided notice to affected individuals
Offered 24 months of free credit monitoring through Experian IdentityWorks
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 21 days(21 days from discovery to filing)
Compliance flags: ME AG ≤30d · 21d
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: May 21, 2026
→ Filed with AG: Jun 11, 2026
21d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 21, 2026 → Filed with AG: Jun 11, 2026	21d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

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-a1252b4f8318/3f68117b-74d8-49c4-9cb2-79ab937dfefb.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 11, 2026
Raw hash: 52750a117ac644f803fbfe3fc7b47cf7a1b958b6c94c10e0cf0454163faaec5c

Reporting entityOrrstown Bank

Victim entityOrrstown Bank

Incidentdiscovered May 21, 2026

Stated responseProvided notice to affected individuals

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov