HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedIdentity (basic)Financial accountLowContained

Mercadien, P.C., CPAs

bd_b06b2f75cc90e445 · schema v1 · pii pii-v1

Severity

Low

Discovered

Nov 7, 2025

Filed

Feb 17, 2026

To disclose

15 weeks

Affected

Not disclosed

Linked

12 filings

Confidence

69%

Mercadien, P.C., CPAs, a professional services firm, disclosed a data incident affecting personal information (names and financial account numbers) of individuals. Unauthorized access occurred between September 17, 2025, and October 9, 2025. The firm discovered the incident on November 7, 2025, engaged forensic experts, notified law enforcement, and provided 12 months of credit monitoring. No evidence of misuse was found at the time of notification.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 51 days

discovery → filing · 15 weeks / 102 days

Sep 17, 2025

Begins

Nov 7, 2025

Discovered

Feb 17, 2026

Filed

vs. sector median

5 wks faster

This filing is one of 12 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Indiana State AGbd_5a136d8dad7a13462026-02-17Verified
Nebraska State AGbd_9581ab095364e27d2026-02-17Verified
South Carolina State AGbd_bb8b76494cae40c62026-02-23 · +6dVerified
Texas State AGbd_7b787e3dbbd82d8e2026-02-24 · +7dVerified

Show 6 more filings ↓up to 238d gap

New Hampshire State AGbd_6a472f77725ed7622026-01-05 · +43dVerified
Maine State AGbd_be4f63906a17f7282025-12-31 · +48dCandidate
New Hampshire State AGbd_aea05dfcc088a1bf2026-07-20 · +153dVerified
California State AGbd_3c090c1ae9c357382026-10-12 · +237dVerified
Oregon State AGbd_9073a5be3f931a412026-10-12 · +237dVerified
Texas State AGbd_cc54cf6a9eb2d0c22026-10-13 · +238dVerified

Showing first 10 of 11 linked disclosures.

Name: Mercadien, P.C., CPAs
norm: mercadien

Name: Mercadien, P.C., CPAs
norm: mercadien
Industry: Professional Servicesllm

Discovered: Nov 7, 2025
Breach occurred: Sep 17, 2025 – Oct 9, 2025
Undetected for: 51 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 17, 2026
Affected individuals: Not disclosed
Data types: Identity (basic)Financial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Engaged third-party forensic experts
Hardened and enhanced network security
Conducted a digital forensic investigation
Notified law enforcement
Changes made: Provided 12 months of free credit monitoring through Epiq - Privacy Solutions ID
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 15 weeks(102 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 9 states

View merged incident ↗

Maine State AGDec 31 · first

New Hampshire State AG+5d

Indiana State AG+48d

Nebraska State AG+48d

Delaware State AG+48d · this page

South Carolina State AG+54d

Texas State AG+55d

New Hampshire State AG+201d

California State AG+285d

Oregon State AG+285d

Texas State AG+286d

Pattern: first filing Dec 31 (ME), last Oct 13 (TX) — a 286-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 11 — the full spread may be wider.

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://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2026/03/Mercadien-MCU-Adult-12-months-Notice-Redacted.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 17, 2026
Raw hash: 3a378270ae6cb63649575c0e22f821ab27d8e66269dae0b341d555e129517672

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityMercadien, P.C., CPAs

Victim entityMercadien, P.C., CPAs

Incidentdiscovered Nov 7, 2025

Stated responseEngaged third-party forensic experts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceattorneygeneral.delaware.gov