high severity November 09, 2025 · 4 min read Unverified claim — what this is

Middlesex Endodontics Listed by Sinobi Ransomware Group

If you are a customer of Middlesex Endodontics, here’s what is being claimed, and what it would mean for you.

Middlesex Endodontics is conveniently located in Burlington and Winchester, MA. Our experienced team of endodontists and staff is dedicated to providing the highest level of professional care for our patients. Besides routine endodontics (root canals), our services also include: Pediatric endodontics, Post removal and retreatment, Endodontic surgery, and Implants. EXPERIENCE For over 40 years our practice has worked together with area dentists to provide the best overall dental care. Supporting our 5 endodontists is an experienced staff --many members of which have been with us for over 15 yea
— from Sinobi’s own leak-site posting. This is the group’s claim, quoted verbatim; it is not GalaxyWarden’s reporting and has not been independently verified.

Middlesex Endodontics Listed by Sinobi Ransomware Group

Middlesex Endodontics, a dental practice with offices in Burlington and Winchester, Massachusetts, has been listed on the leak site of the sinobi ransomware group. The practice, which has served patients for more than 40 years, is claimed to have had internal files exfiltrated during a ransomware attack. While the exact number of patients affected remains unknown, the breach involves sensitive internal records that could include personal and medical information belonging to individuals and families who received root canals, pediatric endodontics, implants, or other procedures there.

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What Public Reporting Shows

Public reporting indicates that sinobi added Middlesex Endodontics to its leak site on November 09, 2025. The group claims to have exfiltrated internal files as part of a ransomware incident. No specific volume of records or detailed patient count has been publicly confirmed. The practice’s own description notes it supports five endodontists with a long-tenured staff and offers services including routine root canals, pediatric care, post removal, retreatment, endodontic surgery, and implants.

Available reporting describes the data as “internal files” without further public breakdown of exact document types at the time of publication. The listing appears on the group’s dedicated leak site, a common tactic used to pressure victims into payment.

Why This Matters for You and Your Family

When a local medical provider like Middlesex Endodontics suffers a breach, the people most exposed are ordinary patients and their families. Dental and medical records often contain full names, addresses, dates of birth, Social Security numbers, insurance details, and clinical notes. Once stolen, this information can be sold, combined with other leaks, or used to commit identity theft, file fraudulent tax returns, or open accounts in your name.

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What the free scan actually returns

Sample resultyou@email.comIllustrative — not a real person

Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Sinobi · 274 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed November 09, 2025

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

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Sinobi — 274 incidents tracked

Every breach we've attributed to Sinobi, in one running log. See who else they've hit →

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