An unidentified individual has listed the data of 760,000 Discord.io users for sale on a darknet forum. This discovery was brought to light by the “Information Leaks” Telegram channel, associated with the Russian service for tracking vulnerabilities, data leaks, and monitoring fraudulent online resources.
For clarity, Discord.io is a third-party interface tailored for the widely-used Discord messenger. The offered database comprises details like email addresses, hashed passwords, and other user-specific data.
Depending on how that authentication handshake is implemented secrets can be leaked. It could be a security flaw on Discord’s side that Discord.io has access to via SSO, or it could be that Discord.io stores username and password for some reason.