SSO issue with custom federated authenticator

[Thisara-Welmilla]

Description

Feature:

• Support for external custom authention extension #20809

Erroneous Scenario:

1. Log in to App1 using a custom federated authenticator. Do not log out.
2. Attempt to log in to App2 using the same browser.

Behavior:
When credentials are entered on the App2 login page and submitted, the page reloads instead of proceeding. However, after the reload, the authenticator flow works as expected.

Note: This issue occurs only when the user is authenticated in the first app using a custom federated authenticator and then tries to SSO into another account from the same browser.

The following error appears in the server terminal:

[2025-02-10 01:37:46,714] [c7197e5a-94c5-4fce-8d3d-2ffaa893057b] ERROR {org.wso2.carbon.identity.application.authentication.framework.store.SessionDataStore} - Error while storing session data org.wso2.carbon.identity.application.authentication.framework.exception.SessionSerializerException: Error while serializing the session object
	at org.wso2.carbon.identity.application.authentication.framework.store.JavaSessionSerializer.serializeSessionObject(JavaSessionSerializer.java:45)
	at org.wso2.carbon.identity.application.authentication.framework.store.SessionDataStore.setBlobObject(SessionDataStore.java:742)
	at org.wso2.carbon.identity.application.authentication.framework.store.SessionDataStore.persistSessionData(SessionDataStore.java:642)
	at org.wso2.carbon.identity.application.authentication.framework.store.SessionDataStore.storeSessionData(SessionDataStore.java:484)
	at org.wso2.carbon.identity.application.authentication.framework.cache.AuthenticationContextCache.addToCache(AuthenticationContextCache.java:127)

wjc-gojm-vmr.2025-02-10.01_37.GMT+5_30.mp4

Version

No response

[malithie]

This is fixed with wso2/carbon-identity-framework#6498