Our Analysts Found the QuantShare Database Circulating in Underground Markets

HEROIC analysts recieved intelligence on the QuantShare breach while monitoring underground data marketplaces in late 2024. The breach, which originally occured in August 2017, exposed 23,032 user records from this Tunisian trading software platform. What made this find alarming was not just the age of the data but what was inside: email addresses and passwords stored in plain text, meaning anyone who got hold of this file could log straight into user accounts without any additional effort.

Why Plaintext Passwords Put QuantShare Users at Serious Risk

When passwords are stored in plaintext, attackers do not need to crack anything. They simply read the file and try those exact credentials on other websites. QuantShare users who reused their password on banking apps, email accounts, or other trading platforms are partcularly exposed. Attackers can automate this process and test thousands of accounts within minutes.

What Was Exposed in the QuantShare Breach

• Email Address
• Plaintext Password

Why the QuantShare Breach Still Matters Today

Old breaches do not expire. This data has been circulating in underground markets and credential stuffing lists for years. Attackers use these files to attempt account takeovers across dozens of services at once. If a QuantShare user recycled their password on Gmail, PayPal, or another trading platform, that account remains at risk right now. Identity theft and financial fraud are real outcomes when email and password pairs fall into the wrong hands.

How Database Breaches Work

A database breach happens when attackers find a way to access and copy the files a website uses to store user information. This can happen through a software vulnerability, a misconfigured server, or stolen admin credentials. Once inside, attackers download the entire user table and walk away with every account on the platform. The victims rarely know anything happened until the data shows up for sale online.

Check If Your Data Was Exposed

HEROIC's free breach scanner searches across more than 400 billion records to tell you instantly whether your email address appears in known breach databases including the QuantShare incident. Run a free scan today at HEROIC.com and find out if your credentials are already in the hands of attackers.