CORS errors for a small subset of customers

Incident Report for LaunchDarkly

Resolved

A small number of customers using the LaunchDarkly JavaScript client side SDK with use cases that involved a single browser session requesting the same LaunchDarkly environment from two or more domains in certain situations experienced CORS errors when initializing the SDK from secondary domains. The impact started on Aug 22 and was mitigated on Aug 26. This issue has now been resolved.
Posted Aug 26, 2025 - 21:00 PDT