Issue
All SAML SSO Logins failed in the Stytch Platform.
Timeline
October 20th, 2025
16:30 - 18:01 UTC
Cause
A widespread outage in AWS created a knock-on effect that uncovered a latent certificate management issue within the Stytch SSO service. Other Stytch services, like the core Authentication API, responded appropriately in the face of downtime and continued to operate as expected. The result was that all SAML SSO login attempts during this incident returned an invalid certificate error and prevented users from logging in.
Remediation
Stytch updated the SSO service to handle certificate management so that it aligns with our other services that did not error. This reconfiguration will prevent this error from recurring in the event of AWS failure again in the future.
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