HackingGovernmentGovernmentCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDMediumContained

Oklahoma Tax Commission

bd_9761396221115132 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 1, 2025

Filed

Mar 27, 2026

To disclose

17 weeks

Affected

Not disclosed

Linked

7 filings

Confidence

65%

Full breach record for Oklahoma Tax Commission →

The Oklahoma Tax Commission (OTC) notified individuals that unauthorized access occurred to W-2 and 1099 files in the OkTAP system between July 5, 2024, and December 20, 2025. The OTC learned of suspicious activity in December 2025. Affected data includes names and Social Security numbers. The OTC engaged third-party forensic specialists, cooperated with the IRS, and implemented additional safeguards. Credit monitoring is offered.

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Incident timeline

undetected · 514 days

discovery → filing · 17 weeks / 116 days

Jul 5, 2024

Begins

Dec 1, 2025

Discovered

Mar 27, 2026

Filed

This filing is one of 7 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
Indiana State AGbd_c855c9473a93d5942026-03-27Verified
Vermont State AGbd_d4fd04889cc15d7c2026-03-27Candidate

Show 2 more filings ↓up to 3d gap

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

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

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

Discovered: Dec 1, 2025
Breach occurred: Jul 5, 2024 – Dec 20, 2025
Undetected for: 514 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 27, 2026
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Unknown
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Cooperating with the Internal Revenue Service (“IRS”) to further its investigation so it can monitor fraudulent tax filing activity

During the incident: Launched an investigation into the suspicious activity with the assistance of third-party cybersecurity and digital forensic specialists
Cooperating with the Internal Revenue Service (“IRS”) to further its investigation so it can monitor fraudulent tax filing activity
Conducted a thorough review of the affected files and determined information related to you was included in the files
Reviewing its existing security standards
Implemented additional safeguards in the OkTAP system to protect against similar incidents moving forward
Offering immediate access to complimentary single bureau credit monitoring and fraud assistance for twelve (12) months from the date of enrollment, at no cost to you through Cyberscout, a TransUnion company
Changes made: 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: — (clock not assessable for this source)

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

Indiana State AGMar 27 · first

Vermont State AGMar 27 · first

Massachusetts State AGMar 27 · first

California 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://oag.ca.gov/ecrime/databreach/reports/sb24-620935
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: 945df45586e9fea94a5583565bddd71acadeef6e675d8f933a1d53b302fa67e2

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityOklahoma Tax Commission

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

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov