HackingVulnerability ExploitData ExfiltratedSupply Chain (3P Vendor)Customer Data InvolvedIDENTITY_BASICHEALTH_BASICLowContained
Blue Cross and Blue Shield of Massachusetts, Inc.
bd_cf54a7692c42c7aa · schema v1 · pii pii-v1
Full breach record for Blue Cross and Blue Shield of Massachusetts, Inc. →Welltok, Inc., a healthcare technology vendor, disclosed that an unknown actor exploited software vulnerabilities in its MOVEit Transfer server on May 30, 2023, exfiltrating data including names, dates of birth, and health insurance information. The incident was discovered on July 26, 2023. Welltok is offering credit monitoring to affected individuals.
California clockDiscovered Jul 26, 2023 → Notified Dec 14, 2023141d ✗ CA 60-day late24 weeks discovery → filing
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/sb24-579073
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
- Filed at
- Jan 8, 2024
- Raw hash
- 88cc0f96c4b5982f5917c3bd730b110ad8c98f791b38b602a65fb92ce07cc7a1
Reporting entity
- Name
- Welltoknorm: welltok
- Domain
- welltok.com
Victim entity
- Name
- Blue Cross and Blue Shield of Massachusetts, Inc.norm: blue cross and blue shield of massachusetts
Incident
- Discovered
- Jul 26, 2023
- Materiality determined
- —
- Notification sent
- Dec 14, 2023
- Affected individuals
- Not disclosed
- Data types
- IDENTITY_BASICHEALTH_BASIC
- Attack vector
- Unauthorized Access
- MITRE ATT&CK
- T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
- Threat actor
- External
- Initial access
- exploit_public_facing
Compliance
- Time to disclose
- 24 weeks(166 days from discovery to filing)
- Compliance flags
- CA 60-day late · 141d
- 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: Jul 26, 2023→ Notified: Dec 14, 2023141d 60 days (analyst band, pre-2026 discoveries) CA 60-day late
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.