HackingFinancial ServicesFinanceVulnerability ExploitSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Financial accountLowContained

Sunflower Bank, National Association

bd_fea17e438a10a5c6 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 31, 2023

Filed

Oct 4, 2023

To disclose

18 weeks

Affected

Not disclosed

Linked

8 filings

Confidence

65%

Full breach record for Sunflower Bank, National Association →

Sunflower Bank, N.A. notified customers of a security incident involving a vulnerability in Progress Software's MOVEit file transfer software. The bank was notified of the vulnerability on May 31, 2023. The incident potentially exposed first and last names and financial transaction information. The bank engaged forensic experts, applied patches, and offered credit monitoring.

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California clockDiscovered May 31, 2023 → Notified Sep 27, 2023119d ✗ CA 60-day late18 weeks discovery → filing

Incident timeline

undetected · 4 days

discovery → filing · 18 weeks / 126 days

May 27, 2023

Begins

May 31, 2023

Discovered

Oct 4, 2023

Filed

vs. sector median

+10 wks slower

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

Part of Progress Software Corporation supply-chain incident (2023) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

New Hampshire State AGbd_46ae3c2793a327922023-10-02 · +2dVerified
Massachusetts State AGbd_57054109e6719b1e2023-08-22 · +43dVerified
California State AGbd_895de35e1cea98f02023-08-15 · +50dVerified
Montana State AGbd_b791064e55b0bfd82023-08-15 · +50dVerified

Show 3 more filings ↓up to 82d gap

New Hampshire State AGbd_ef42af6291b75a202023-08-15 · +50dVerified
Indiana State AGbd_791c96ad5aceed032023-08-14 · +51dVerified
SEC 8-Kbd_d36ee2ad177829e82023-07-14 · +82dVerified

Name: Sunflower Bank, National Association
norm: sunflower bank national

Name: Sunflower Bank, National Association
norm: sunflower bank national
Industry: Financial Servicesllm

Discovered: May 31, 2023
Breach occurred: May 27, 2023
Undetected for: 4 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 27, 2023
Affected individuals: Not disclosed
Data types: Identity (basic)Financial account
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1195 Supply Chain Compromise
Threat actor: External
Regulator citations: Reported this incident to law enforcement
Third party: via Progress Software Corporation
Initial access: supply_chain

During the incident: Enacted incident response protocols
Engaged outside technical experts to investigate
Implemented all fixes to the software that Progress Software has issued
Continuing to closely monitor the system for any unusual activity
Reported this incident to law enforcement
Changes made: Offering 12/24 months of free credit monitoring and $1 million in identity theft insurance through Experian
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 weeks(126 days from discovery to filing)
Compliance flags: CA 60-day late · 119d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: May 31, 2023
→ Notified: Sep 27, 2023
119d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: May 31, 2023 → Notified: Sep 27, 2023	119d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 5 states

View merged incident ↗

SEC 8-KJul 14 · first

Indiana State AG+31d

California State AG+32d

Montana State AG+32d

New Hampshire State AG+32d

Massachusetts State AG+39d

New Hampshire State AG+80d

California State AG+82d · this page

Pattern: first filing Jul 14, last Oct 4 (CA) — a 82-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://oag.ca.gov/ecrime/databreach/reports/sb24-574636
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 4, 2023
Raw hash: a64e27a2f7c7fe6c6d17c06a9034255e36eec914e968b53c005ce987d700b437

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entitySunflower Bank, National Association

Victim entitySunflower Bank, National Association

Incidentdiscovered May 31, 2023

Stated responseEnacted incident response protocols

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov