Marquis confirms sensitive personal data of 672,000 people stolen in ransomware attack

Date:
Thu, 19 Mar 2026 17:00:00 +0000

Description:
The August 2025 SonicWall breach keeps getting worse, as Marquis sues SonicWall for negligence.

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Tech Radar Get the TechRadar Newsletter Sign up for
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now subscribed Your newsletter sign-up was successful An account already exists for this email address, please log in. Subscribe to our newsletter Marquis confirms August 2025 breach impacted 670,000+ people Attack tied to SonicWall MySonicWall brute-force incident exposing firewall configs Marquis is suing SonicWall, which disputes connection between the two events The August 2025 cyberattack on Marquis affected more than 670,000 people, the company confirmed earlier this week.

Marquis is a US fintech company building software for banks and credit
unions, and to defend its internal network, it uses a firewall built by SonicWall. In mid-September 2025, SonicWall warned its firewall customers to reset their passwords after unnamed threat actors brute-forced their way into the companys MySonicWall cloud service. Article continues below You may like Marquis confirms data breach, point finger of blame at SonicWall firewall Aflac reveals personal data of 22.6 million people stolen in cyberattack - here's what we know Ingram Micro reveals ransomware attack hit 42,000 people
- here's how to find out more Lawsuit filed This tool allows SonicWall firewall users to back up their firewall configuration files, including network rules and access policies, VPN configurations, service credentials (LDAP, RADIUS, SNMP), or admin usernames and passwords (if stored in config).

SonicWall later confirmed that all of its customers were affected, and
Marquis said it was among them .

Initially, there were no reports on the number of people affected. Marquis filed reports with multiple Attorney Generals Offices, stating that different types of information were stolen in different states. "The personal information potentially involved for Maine residents includes names, addresses, phone numbers, Social Security numbers, Taxpayer Identification Numbers, financial account information without security or access codes, and dates of birth, it said in its Maine filing.

Now, BleepingComputer says the company confirmed more than 670,000 victims. Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed! Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.

"The incident was limited to Marquiss systems and did not affect our
customers systems," the company told affected individuals, as per the publication. "Our customer reviewed the affected files on December 10, 2025, and afterwards worked to validate and identify individuals whose information may have been affected by the incident, and our customer worked as quickly as possible to obtain individuals most recent mailing address information."

In the meantime, Marquis has filed a lawsuit against SonicWall, claiming the attack was the result of the companys conduct. SonicWall, on the other hand, argues that there is no evidence of the two incidents being connected.

Via BleepingComputer The best antivirus for all budgets Our top picks, based on real-world testing and comparisons

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Link to news story: https://www.techradar.com/pro/security/marquis-confirms-sensitive-personal-dat a-of-672-000-people-stolen-in-ransomware-attack


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