FEDERALItem 8.01 · voluntaryHackingFinancial ServicesFinanceData ExfiltratedPIILowActive

Heritage Financial Corporation

bd_d74d56aac9509413 · schema v1 · pii pii-v1

Severity

Low

Discovered

Mar 2, 2026

Filed

Mar 23, 2026

To disclose

21 days

Affected

Not disclosed

Confidence

68%

Full breach record for Heritage Financial Corporation →

Heritage Financial Corporation (CIK 0001046025) filed an 8-K dated March 20, 2026, reporting a cybersecurity incident detected on or about March 2, 2026. The incident involved unauthorized access to an internal file share server and subsequent exfiltration of files potentially containing personal information. Customer accounts and operations were not impacted. The company took the system offline, engaged forensic investigators and legal counsel, and notified regulators and law enforcement. The company stated that, as of the filing date, it had not determined that the incident is material.

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Incident timeline

discovery → filing · 21 days

Mar 2, 2026

Discovered

Mar 23, 2026

Filed

vs. sector median

5 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Heritage Financial Corporation
norm: heritage financial
SEC CIK: 0001046025

Name: Heritage Financial Corporation
norm: heritage financial
SEC CIK: 0001046025
Industry: Financial Servicesllm

Discovered: Mar 2, 2026
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1041 Exfiltration Over C2 Channel
Regulator citations: notified its banking regulatorsnotified law enforcement

During the incident: Initiated its security incident response plan
Taking the affected system offline
Engaged experienced external advisors, including an independent forensic investigation firm and legal counsel
Notified its banking regulators, law enforcement and cyber insurance carrier
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 21 days(21 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

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 filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/1046025/000162828026020261/hfwa-20260320.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Mar 23, 2026
Raw hash: 4108760495d402a98723153fa644527c685f8479d7bfdf66e79a5a3488a07b4c

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Reporting entityHeritage Financial Corporation

Victim entityHeritage Financial Corporation

Incidentdiscovered Mar 2, 2026

Stated responseInitiated its security incident response plan

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing