For repositories stored on Bitbucket, the `bitbucket` backend allows CMS users to log in directly with their Bitbucket account. Note that all users must have write access to your content repository for this to work.
To enable it:
1. Follow the authentication provider setup steps in the [Netlify docs](https://www.netlify.com/docs/authentication-providers/#using-an-authentication-provider).
2. Add the following lines to your Netlify CMS `config.yml` file:
1. Follow the [Atlassian docs](https://confluence.atlassian.com/bitbucket/oauth-on-bitbucket-cloud-238027431.html) to create an OAuth consumer. Make sure you allow `Account/Read` and `Repository/Write` permissions. To use the [Editorial Workflow](https://www.netlifycms.org/docs/configuration-options/#publish-mode), allow `PullRequests/Write` permissions. For the **Callback URL**, enter the address where you access Netlify CMS, for example, `https://www.mysite.com/admin/`.
**Warning:** With Bitbucket implicit grant, the authentication is valid for 1 hour only. After that, the user has to login again, **which can lead to data loss** if the expiration occurs while content is being edited.