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Betterment breach may expose 1.4M users after social engineering attack. Breach-tracking site flags dataset following impersonation-based intrusion. Breach-tracking site Have I Been Pwned (HIBP) claims a cyberattack on Betterment affected roughly 1.4 million users – although the investment company has yet to publicly confirm how many customers were affected by January's intrusion. The figure surfaced today after HIBP added the incident to its database. HIBP says the dataset tied to the attack contains approximately 1.4 million unique email addresses, along with partial personal information that aligns with details previously acknowledged by the fintech firm. Nitrogen ransomware is so broken even the crooks can't unlock your files Betterment, which offers automated investment and financial planning services, first disclosed the breach in January after detecting unauthorized access to certain internal systems on January 9. Betterment said the hacker gained entry through a social engineering scheme that relied on impersonation to infiltrate third-party marketing and operations tools, then used that access to send customers a fraudulent cryptocurrency promotion disguised as an official company message. In its most recent customer update, published on February 3, Betterment said the intrusion did not expose customer accounts, passwords, or login credentials, and the fallout involved customer contact details, including names and email addresses. For a subset of users, the accessed data also included additional information such as physical mailing addresses, phone numbers, or dates of birth. It is working with an independent data analytics provider to review material allegedly posted online by a group claiming responsibility for the breach. While Betterment hasn't said who was behind the incident, the notorious ShinyHunters crew recently told The Register that it gained access to Betterment's systems by voice phishing its Okta single sign-on codes.  The extortion group claimed to have leaked 20 million Betterment records, but its dark web leak site was offline at the time of publication. Betterment did not immediately respond to The Register's questions. While Betterment has stressed that investment accounts and authentication data were not touched, exposure of contact and identity-related details still carries risk. Such datasets are prized by phishing campaigns and account takeover attempts, particularly when tied to financial services users. Betterment advises customers to be skeptical of unsolicited emails or calls. It says it won't ask for passwords or financial information via unsolicited messages. The incident also serves as a useful reminder that while companies like Betterment automate investing, they still collect plenty of personal data that attackers are keen to get their hands on.