Seoul — Kakao Enterprise has confirmed a major security breach on its unified business collaboration platform, KakaoWork, impacting the personal data of corporate employees and platform users.

According to an official company statement released on Friday, an unauthorized external entity breached the systems of DK Techin on December 9, extracting sensitive user data. The compromised information spans names, nicknames, corporate departments, mobile numbers, email addresses, email contents, attachment files, and encrypted messaging logs.

The inclusion of internal business email bodies and raw attachments has heightened concerns over potential corporate espionage or internal data exposure, though officials noted that decryption status and exact file contents remain under review. Impacted individuals include current and former staff, external contractors utilizing corporate credentials, and select email recipients.

In response to the incident, DK Techin severed unauthorized access channels and launched a joint investigation alongside Kakao Enterprise and regulatory authorities.

Although direct password compromises have not been detected, Kakao Enterprise has advised all system users to immediately update their credentials for KakaoWork and corporate email accounts. Furthermore, users are strongly cautioned against phishing attempts, fraudulent text messages, and suspicious email attachments purportedly sent by platform representatives. The company stated that customized breach notifications will be sent directly to affected accounts as the investigation progresses.

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