Slack OAuth & OpenID connect Single Sign-On (SSO) | Slack SSO Login

Slack OAuth & OpenID connect Single Sign-On (SSO) | Slack SSO Login


WordPress OAuth & OpenID Connect Single Sign-On (SSO) plugin enables secure login into WordPress using Slack as OAuth and OpenID Connect provider. You can also configure plugin using different custom providers and standard IDPs. It supports advanced Single Sign-On (SSO) features such as user profile Attribute mapping, Role mapping, etc. Here we will go through a guide to configure SSO between WordPress and Slack. By the end of this guide, users should be able to login to WordPress from Slack. To know more about other features we provide in WP OAuth Single Sign-On ( OAuth & OpenID Connect Client ) plugin, you can click here.

Pre-requisites : Download And Installation


  • Log into your WordPress instance as an admin.
  • Go to the WordPress Dashboard -> Plugins and click on Add New.
  • Search for a WordPress OAuth Single Sign-On (SSO) plugin and click on Install Now.
  • Once installed click on Activate.



Steps to configure Slack Single Sign-On (SSO) Login into WordPress

1. Setup Slack as OAuth Provider

  • First of all, go to https://api.slack.com/apps and log into your Slack account.
  • You will be presented with following screen. Click on Create new App.
  • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO create new app
  • You will be shown a form where you have to enter Application Name and Development Slack Workspace. Fill the form with appropriate information and click on Create App.
  • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO create app
  • After creating the slack application, you will be brought to Application Management page. Scroll down to “App Credentials” section. Here you will find given Client ID and Client Secret for your slack application.
  • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO client id client secret
  • Copy these credentials in MO OAuth Plugin configuration on corresponding fields.
  • Go to OAuth & Permissions
  • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO oauth permission
  • Add Redirect URL: In slack application's Redirect URLs section, Click on Add New Redirect URL and enter the same from the MO OAuth Client. Click on Save URLs.
  • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO redirect urls
  • Scope: Go to OAuth & Permissions, select scope from Select Permission Scopes dropdown list and Save Changes. Identity basic is required scope.
  • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO add scope
  • Then, scroll Down to Scopes section and add necessary scopes like so and then click on Save Changes.
    Most importantly, these scopes must be same on the MO OAuth Application Configuration page.
  • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO scopes

You have successfully configured Slack as OAuth Provider for achieving Slack login into your WordPress Site.


2. Setup WordPress as OAuth Client

  • Go to Configure OAuth tab and configure App Name, Client ID, Client Secret from provided Endpoints.
  • openid is already filled but if it doesn't work then configure scope as User.Read and for fetching group info use scope is Directory.read.all.
  • Please refer the below table for configuring the scope & endpoints for Slack in the plugin.

  • Client ID : Click Here
    Client Secret : Click Here
    Scope: users.profile:read
    Authorize Endpoint: https://slack.com/oauth/authorize
    Access Token Endpoint: https://slack.com/api/oauth.access
    Get User Info Endpoint: https://slack.com/api/users.profile.get
  • Click on Save Settings to save the configuration.
  • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO save settings

You have successfully configured WordPress as OAuth Client for achieving Slack login into your WordPress Site.


3. User Attribute Mapping

  • User Attribute Mapping is mandatory for enabling users to successfully login into WordPress. We will be setting up user profile attributes for WordPress using below settings.
  • Finding user attributes

    • Go to Configure OAuth tab. Scroll down and click on Test Configuration.
    • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO create new app test congifuration
    • You will see all the values returned by your OAuth Provider to WordPress in a table. If you don't see value for First Name, Last Name, Email or Username, make the required settings in your OAuth Provider to return this information.
    • wordpress oauth client plugin sso : test congifuration result
    • Once you see all the values in Test Configuration, go to Attribute / Role Mapping tab, you will get the list of attributes in a Username dropdown.
    • OAuth/OpenID/OIDC Single Sign On (SSO) Slack SSO attribute/role mapping

4: Role Mapping [Premium]

  • Click on “Test Configuration” and you will get the list of Attribute Names and Attribute Values that are sent by your OAuth provider.
  • From the Test Configuration window, map the Attribute Names in the Attribute Mapping section of the plugin. Refer to the screenshot for more details.
  • Slack Single Sign-On (SSO) - attribute mapping
  • Enable Role Mapping: To enable Role Mapping, you need to map Group Name Attribute. Select the attribute name from the list of attributes which returns the roles from your provider application.
    Eg: Role

  • Slack Single Sign-On (SSO) - test configuration - role mapping
  • Assign WordPress role to the Provider role: Based on your provider application, you can allocate the WordPress role to your provider roles. It can be a student, teacher, administrator or any other depending on your application. Add the provider roles under Group Attribute Value and assign the required WordPress role in front of it under WordPress Role.

    For example, in the below image. Teacher has been assigned the role of Administrator & Student is assigned the role of Subscriber.
  • Slack Single Sign-On (SSO) - test configuration - role mapping
  • Once you save the mapping, the provider role will be assigned the WordPress administrator role after SSO.
    Example: As per the given example, Users with role ‘teacher’ will be added as Administrator in WordPress and ‘student’ will be added as Subscriber.

5: Login Settings / Sign In Settings

  • The settings in Single Sign-On (SSO) Settings tab define the user experience for Single Sign-On (SSO). To add a Slack login widget on your WordPress page, you need to follow the below steps.
  • 1. Sign in settings for wordpress 5.7 and before :

    • Go to WordPress Left Panel > Appearances > Widgets.
    • Select miniOrange OAuth. Drag and drop to your favourite location and save.
    • Slack Single Sign-On (SSO) OAuth/OpenID WordPress create-newclient login button setting

    2. Sign in settings for wordpress 5.8 :

    • Go to WordPress Left Panel > Appearances > Widgets.
    • Select miniOrange OAuth. Drag and drop to your favourite location and save.
    • Slack Single Sign-On (SSO) OAuth/OpenID WordPress create-newclient login button setting
    • Open your WordPress page and you can see the Slack SSO login button there. You can test the Slack Single Sign-On (SSO) now.

In this Guide, you have successfully configured Slack Single Sign-On (SSO) by configuring Slack as OAuth Provider and WordPress as OAuth Client using our WP OAuth Single Sign-On ( OAuth / OpenID Connect Client ) plugin.This solution ensures that you are ready to roll out secure access to your WordPress site using Slack login credentials within minutes.


Additional Resources


Mail us on oauthsupport@xecurify.com for quick guidance(via email/meeting) on your requirement and our team will help you to select the best suitable solution/plan as per your requirement.

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