One of the largest lead generation datasets ever compiled has been found exposed online, containing 4.3 billion professional records in a 16 terabyte unsecured database.
By 2027 the race to become the first cosmic CEO is moving from science fiction to strategy. Starcloud has already trained an AI model in orbit on an Nvidia H100, while Google prepares Project Suncatcher. What remains missing is not ambition, but clear pricing and proof orbital compute can pay.
Melbourne-based broker ThinkMarkets has been hit by the Chaos ransomware group, which stole 512GB of data. The breach includes employee passports and customer KYC records, posing a major risk to the Australian financial services firm and its clients worldwide.
One of the largest lead generation datasets ever compiled has been found exposed online, containing 4.3 billion professional records in a 16 terabyte unsecured database.
Cyber News Centre’s cyber update for 15th December 2025: One of the largest lead generation datasets ever compiled has been found exposed online, containing 4.3 billion professional records in a 16 terabyte unsecured database.
The database, believed to belong to a lead generation company, contained professionally scraped and enriched data from sources including LinkedIn and Apollo.io. Lead generation firms compile and sell large scale B2B databases to help businesses find and connect with potential customers.
Update: A 16 terabyte unsecured MongoDB database containing 4.3 billion professional records was discovered exposed on the internet without a password. The dataset, found by security researcher Bob Diachenko in collaboration with nexos.ai on November 23, 2025, was secured two days after the apparent owner was notified. The trove includes nine collections of scraped and enriched data, with at least three containing personally identifiable information on nearly two billion records. Exposed data includes full names, email addresses, phone numbers, LinkedIn URLs, job titles, employers, employment histories, education, locations, skills and in some cases profile photographs.
The database also contained sitemap records linking to a lead generation company’s website, which advertises access to over 700 million professionals, a figure that closely matches the size of one of the database’s collections. The timestamps suggest the data was collected or updated in 2025, making it a fresh and globally relevant dataset. The incident highlights the ongoing risks of unsecured databases and the industrial scale scraping of professional networking platforms for commercial purposes, creating a goldmine for malicious actors.
Why it Matters: This breach provides a ready made blueprint for sophisticated, AI driven social engineering attacks on a global scale, affecting professionals and organisations in Australia and worldwide. With structured data on billions of individuals, malicious actors can automate highly personalised phishing campaigns, business email compromise schemes and CEO fraud with unprecedented efficiency.
The dataset acts as a foundational layer for profile enrichment, allowing criminals to fuse it with other leaked data such as passwords to create comprehensive dossiers for targeted attacks. For Australian businesses, this means a heightened risk of employees being targeted by convincing, context aware scams that reference their specific roles, colleagues and work histories, bypassing traditional security filters.
Get the stories that matter to you.
Subscribe to Cyber News Centre and update your preferences to follow our Daily 4min Cyber Update, Innovative AI Startups, The AI Diplomat series, or the main Cyber News Centre newsletter — featuring in-depth analysis on major cyber incidents, tech breakthroughs, global policy, and AI developments.
Melbourne-based broker ThinkMarkets has been hit by the Chaos ransomware group, which stole 512GB of data. The breach includes employee passports and customer KYC records, posing a major risk to the Australian financial services firm and its clients worldwide.
Inotiv has confirmed a major data breach after a Qilin ransomware attack exposed the personal, financial and health information of over 9,000 people. The hit on this large US research company highlights rising supply chain risks across the pharmaceutical and healthcare sectors.
Critical React flaw React2Shell is under active state sponsored exploitation, allowing unauthenticated remote code execution across thousands of web apps. ACSC and US CISA have issued urgent warnings, calling on Australian organisations to patch immediately.
A significant supply chain attack has struck the US financial sector, with fintech vendor Marquis Software Solutions confirming a ransomware incident that exposed the sensitive data of hundreds of thousands of customers from dozens of American banks and credit unions.
Where cybersecurity meets innovation, the CNC team delivers AI and tech breakthroughs for our digital future. We analyze incidents, data, and insights to keep you informed, secure, and ahead. Sign up for free!
