MICHIGANHackingHealthcareHealthcarePhishingBusiness Associate (HIPAA)Customer Data InvolvedPHIHealth (basic)Identity (basic)Government IDHighContained

Cornerstone Municipal Advisory Group LLC

bd_40e2ebec48363d23 · schema v1 · pii pii-v1

Severity

High

Discovered

—

Filed

Apr 2, 2021

To disclose

—

Affected

9,202

Confidence

69%

Full breach record for Cornerstone Municipal Advisory Group LLC →

Cornerstone Municipal Advisory Group LLC dba Manquen Vance reported to HHS on 2021-04-02 a Hacking/IT Incident affecting 9202 individuals. Breached information located on Email. An employee was the subject of an email phishing scheme that affected the protected health information (PHI) of 9,202 individuals, including names, addresses, birthdates, Social Security numbers, claims information, diagnoses, lab results, medications prescribed, and other treatment information.

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HIPAA clock✓ HHS notified

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

⚠ No discovery dateThe OCR public portal omits the discovery date, so the 60-day notification clock cannot be evaluated from this source — only that the filing was submitted.

Incident timeline — partial

? — ?

Breach window unknown

Apr 2, 2021

Filed

—

No filing yet · watching

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed9,202 affectedView incident

Name: Cornerstone Municipal Advisory Group LLC
norm: cornerstone municipal advisory
Industry: Health Care Services

Name: Cornerstone Municipal Advisory Group LLC
norm: cornerstone municipal advisory
Also named: Cornerstone Municipal Advisory Group LLCdba oflegal entity
Manquen Vancedba oftrade name
Industry: Healthcaresource default

Discovered: Not extracted — the OCR public portal omits it
Materiality determined: —
Notification sent: —
Affected individuals: 9,202nationwide
Data types: PHIHealth (basic)Identity (basic)Government ID
HHS breach type: Hacking / IT incident
Where the data lived: Email
Covered-entity type: Business associate
Attack vector: Unauthorized Access
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: External
Regulator citations: OCR provided the BA with technical assistance regarding its HIPAA Security Rule obligations
Third party: via Cornerstone Municipal Advisory Group dba Manquen Vancebusiness associate
Initial access: phishing_link

During the incident: Provided complimentary credit monitoring services
Implemented additional administrative, technical, and security safeguards to better protect its PHI
Notified HHS, affected individuals, the media, and provided substitute notice
Changes made: Implemented additional administrative, technical, and security safeguards to better protect its PHI
Source: Quoted from the filing itself, not independently verified.

Compliance flags: HHS notified
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
Clock breakdown: Statute Window Elapsed Threshold Status
HIPAA
Discovered: not extracted
→ Notified: not extracted
— regulatory submission HHS notified

Statute	Window	Elapsed	Threshold	Status
HIPAA	Discovered: not extracted → Notified: not extracted	—	regulatory submission	HHS notified

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 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://ocrportal.hhs.gov/ocr/breach/breach_report.jsf
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Apr 2, 2021
Raw hash: 41b1e640d57334287fb7ed7f362946acd4a47148aff30b78f14ae56f6ac48057

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Reporting entityCornerstone Municipal Advisory Group LLC

Victim entityCornerstone Municipal Advisory Group LLC

IncidentUnauthorized Access

Stated responseProvided complimentary credit monitoring services

ComplianceHHS notified

Extraction provenanceno artifact recorded

Source provenanceocrportal.hhs.gov

Source filing