HackingStolen CredentialsData ExfiltratedCustomer Data InvolvedIDENTITY_GOVERNMENTIDENTITY_BASICMediumContained
CMC Tax Services
bd_0affb0e38e3c3d91 · schema v1 · pii pii-v1
Full breach record for CMC Tax Services →CMC Tax Services, Inc. disclosed a data breach affecting California residents where unauthorized third parties accessed client tax return data between November 30, 2020, and May 17, 2021. The incident involved fraudulent filing of 2020 tax returns using stolen names, Social Security numbers, and dependent information. CMC notified the IRS, engaged forensic investigators, and offered one year of Experian IdentityWorks credit monitoring to affected clients.
Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident
Source provenance
- Source URL
- https://oag.ca.gov/ecrime/databreach/reports/sb24-543068
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
- Filed at
- Jul 20, 2021
- Raw hash
- f0bfc14047ec0431ec64cd8b0719870319bf38623bb91838da4f468f183834c0
Reporting entity
- Name
- CMC Tax Servicesnorm: cmc tax
- Domain
- cmctaxservices.com
Victim entity
- Name
- CMC Tax Servicesnorm: cmc tax
- Domain
- cmctaxservices.com
Incident
- Discovered
- Jun 20, 2021
- Materiality determined
- —
- Notification sent
- —
- Affected individuals
- Not disclosed
- Data types
- IDENTITY_GOVERNMENTIDENTITY_BASIC
- Attack vector
- Unauthorized Access
- MITRE ATT&CK
- T1078 Valid Accounts
- Threat actor
- ExternalFinancial
- Initial access
- valid_credentials
Compliance
- Time to disclose
- 4 weeks(30 days from discovery to filing)
- Compliance flags
- — (clock not assessable for this source)
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.