HackingGovernmentGovernmentData ExfiltratedCustomer Data InvolvedGovernment IDIdentity (basic)MediumContained

Oklahoma Tax Commission

bd_d4fd04889cc15d7c · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 1, 2025

Filed

Mar 27, 2026

To disclose

17 weeks

Affected

10state residents only

Linked

7 filings

Confidence

67%

Full breach record for Oklahoma Tax Commission →

The Oklahoma Tax Commission (OTC) disclosed a data breach affecting its OkTAP system. Unauthorized access occurred between September 18, 2025, and December 20, 2025, exposing names and Social Security numbers from W-2 and 1099 files. The OTC notified 10 Vermont residents on March 27, 2026, offering 12 months of credit monitoring. The incident is contained, with additional safeguards implemented.

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Vermont clock✗ VT AG >45 bday17 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 74 days

discovery → filing · 17 weeks / 116 days

Sep 18, 2025

Begins

Dec 1, 2025

Discovered

Mar 27, 2026

Filed

This filing is one of 7 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

Maine State AGbd_106ec023e6c2444a2026-03-27Candidate
New Hampshire State AGbd_59f67e4c69e023802026-03-27Verified
California State AGbd_97613962211151322026-03-27Verified
Indiana State AGbd_c855c9473a93d5942026-03-27Verified

Show 2 more filings ↓up to 3d gap

Massachusetts State AGbd_dc59596dc40843592026-03-27Verified
Texas State AGbd_1009fe78a84233d02026-03-30 · +3dVerified

Name: SECURITY STATE BANK OF OKLAHOMA
norm: security state bank of oklahoma

Name: Oklahoma Tax Commission
norm: oklahoma tax commission
Domain: tax.ok.gov
Industry: Governmentllm

Discovered: Dec 1, 2025
Breach occurred: Sep 18, 2025 – Dec 20, 2025
Undetected for: 74 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 27, 2026
Affected individuals: 10state-resident count only
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: Providing written notice of this event to relevant state privacy regulatorsProviding written notice to the three (3) major credit reporting agencies: Equifax, Experian, and TransUnion
Initial access: exploit_public_facing

During the incident: Launched an investigation into the suspicious activity with the assistance of third-party cybersecurity and digital forensic specialists
Cooperating with the IRS to further their investigation so they can monitor fraudulent tax filing activity
Undertaking a comprehensive review of the accessed files to determine the individuals involved in the incident
Providing access to complimentary credit monitoring and identity theft protection services for twelve (12) months, through Cyberscout, a TransUnion company
Providing written notice of this event to relevant state privacy regulators and to the three (3) major credit reporting agencies: Equifax, Experian, and TransUnion
Changes made: Reviewing its existing security standards
Implemented additional safeguards in the OkTAP system to protect against similar incidents moving forward
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 weeks(116 days from discovery to filing)
Compliance flags: VT AG >45 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 7 filings · 7 states

View merged incident ↗

Maine State AGMar 27 · first

New Hampshire State AGMar 27 · first

California State AGMar 27 · first

Indiana State AGMar 27 · first

Massachusetts State AGMar 27 · first

Vermont State AGMar 27 · first · this page

Texas State AG+3d

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://ago.vermont.gov/document/2026-03-27-state-oklahoma-data-breach-notice-consumers-pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 27, 2026
Raw hash: 89aaed1cc05b72f6354041233691ffc9f12f087adace443b4c5965aa06699ded

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entitySECURITY STATE BANK OF OKLAHOMA

Victim entityOklahoma Tax Commission

Incidentdiscovered Dec 1, 2025

Stated responseLaunched an investigation into the suspicious activity with the assistance of third-party cybersecurity and digital forensic specialists

ComplianceVT AG >45 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov