# Extend Crowd authentication mechanism?

**URL:** <https://community.developer.atlassian.com/t/extend-crowd-authentication-mechanism/15660>\
**Category:** Crowd Development\
**Created:** [March 5, 2018, 1:15pm UTC](https://community.developer.atlassian.com/t/extend-crowd-authentication-mechanism/15660 "2018-03-05T13:15:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![charlie.misonne](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@charlie.misonne](https://community.developer.atlassian.com/u/charlie.misonne)\
**Post date:** [March 5, 2018, 1:15pm UTC](https://community.developer.atlassian.com/t/extend-crowd-authentication-mechanism/15660/1 "2018-03-05T13:15:23Z")

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I would like to extend how Crowd allows user to authenticate from other linked Atlassian Applications.

In addition of the default authentication mechanism I want to check a custom attribute in the user’s Crowd profile.  
If this property has a certain value the user may authenticate.

Is this feasible in a custom Crowd add-on?

I thought of using the `UserAuthenticatedEvent` but of course this one doesn’t let me intercept the actual authentication.