Cookies

Learn about the cookies required for accessing the Umbraco Backoffice and their purposes.

The cookies listed in this article are required only for accessing the Backoffice. You can include these in your own cookie policy, if you wish.

Necessary Cookies

The below cookies are necessary for accessing the Umbraco Backoffice and functioning of the website. They allow you to enjoy the contents and services you request.

Name	Purpose	Expiration
UMB_PREVIEW	Allows a previewed page to act as a published page only on the browser which has initialized previewing.	Session
UMB-WEBSITE-PREVIEW-ACCEPT	Client-side cookie that determines whether the user has accepted to be in Preview Mode when visiting the website.	Session
umb_installId	Used to store the Umbraco software installer id.	Session
UMB_UPDCHK	Enables your system to check for the Umbraco software updates.	Session
UMB-XSRF-V	Used to store the backoffice antiforgery token validation value.	Session
TwoFactorRememberBrowser	Default authentication type used for storing that 2FA is not needed on next login	Session
UMB_SESSION	Preserves the visitor's session state across page requests.	Session

The UMB_SESSION cookie is secure if you are using HTTPS pages. However, if you wish to secure the cookie in your code, add the following in the Program.cs file after Build();

builder.Services.AddSession(options =>
    {
        options.Cookie.Name = "UMB_SESSION";
        options.Cookie.HttpOnly = true;
        options.Cookie.SecurePolicy = CookieSecurePolicy.Always;
    });

For information on the rest of the cookies, see the Constants-Web.cs file on GitHub.