UnknownFinanceMedium

MAINSTREET FEDERAL CREDIT UNION

bd_95a5aa203651f160 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

May 4, 2026

To disclose

—

Affected · nationwide

4,1231 in this filing

Linked

4 filings

Confidence

95%

Full breach record for MAINSTREET FEDERAL CREDIT UNION →

Mainstreet Credit Union reported a data breach to the Indiana Attorney General. The breach occurred on 2026-01-12 and was reported on 2026-05-04. 1 Indiana residents were affected. 4,123 individuals affected in total.

J jump to incidentP pin to compareR raw source

Incident timeline

Jan 12, 2026

Begins

May 4, 2026

Filed

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

Nebraska State AGbd_a7b719418247207b2026-05-04Verified
Massachusetts State AGbd_8d3fdafae2c42fb42026-06-18 · +45dVerified
New Hampshire State AGbd_dc1bebca2267480f2026-06-18 · +45dVerified

Name: MAINSTREET FEDERAL CREDIT UNION
norm: mainstreet federal credit union

Name: MAINSTREET FEDERAL CREDIT UNION
norm: mainstreet federal credit union

Discovered: —
Breach occurred: Jan 12, 2026
Materiality determined: —
Notification sent: —
Affected individuals: 4,123state + nationwide
Data types: —
Attack vector: Unknown

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Nebraska State AGMay 4 · first

Indiana State AGMay 4 · first · this page

Massachusetts State AG+45d

New Hampshire State AG+45d

Pattern: first filing May 4 (NE), last Jun 18 (NH) — a 45-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.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/security-breaches/
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 4, 2026
Raw hash: 6eaf4b36bd2045f6f84abf4401ac1bdc526952d6f788e40723c562fdb8a31e50

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMAINSTREET FEDERAL CREDIT UNION

Victim entityMAINSTREET FEDERAL CREDIT UNION

IncidentUnknown

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.in.gov