The Curity Identity Server contains a feature that blocks requests from cross-site origins to plugin request handlers. Each plugin can programmatically define the set of handlers can be accessed on cross-site request and the ones that are only usable on same-site requests. This feature is described in Cross-site Plugin Handlers.
However, it is also possible to override this policy using the following system properties:
se.curity.crosssite.block.enabled
false
true
se.curity.crosssite.block.authenticators.deny
html-form
se.curity.crosssite.block.actions.deny
attribute-prompt