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outageMedium3/14/2023

Naver Login System Breakdown Paralyzes Third-Party Integrations

Naver Corp

A server error in the Naver login authentication module prevented users from accessing hundreds of apps.

On March 14, 2023, Naver’s authentication servers suffered a major breakdown, causing a "login loop" for millions of users. This was not only an outage for Naver’s internal services like Cafe and Mail, but also for the thousands of external e-commerce and financial sites that use "Naver Login" for SSO. The disruption lasted approximately 4 hours before a patch was deployed.

Tags

#portal#outage#authentication#breakdown

Last updated: March 7, 2026