Dropbox

Dropbox Accounts Compromised Through Lenovo ID Authentication Flaw

Several thousand Dropbox accounts were breached between August 4 and 21 due to an authorization flaw involving Lenovo ID. The root cause was an error on Lenovo's side that permitted registration of accounts using arbitrary email addresses, which could then be used to access matching Dropbox accounts. Dropbox responded by forcing logouts for all users who had relied on Lenovo ID and by requiring direct password entry for Dropbox credentials. Approximately 5,000 accounts were affected, though only about one-third saw stored files accessed by attackers. Accounts protected by two-factor authentication remained unaffected. Additional reports from the same period covered Kaspersky analysis of ValleyRAT spyware using DLL sideloading, a critical SQL injection vulnerability in the All-in-One WP Migration WordPress plugin, and a Google Chrome update addressing CVE-2026-85046 in the V8 engine.

Dropbox Lenovo ID Integration Flaw Exposes Thousands of Accounts Without Passwords

A flaw in the federated authentication process between Dropbox and Lenovo ID allowed attackers to compromise approximately 5,000 accounts between August 4 and August 21, 2026. Attackers registered a Lenovo ID using the email address tied to an existing Dropbox account due to missing email verification checks. They then logged in via the Lenovo ID option, and Dropbox automatically associated the identity with the existing account without requiring the original Dropbox password. Only accounts linked to the Lenovo ID integration and lacking two-factor authentication were affected. In fewer than one-third of the compromised accounts, attackers viewed or downloaded stored files. Dropbox responded by terminating all Lenovo ID sessions, removing existing associations, and updating the login flow to require the Dropbox password. Lenovo described the issue as stemming from a legacy integration and stated that its own customers were not directly impacted.