diff --git a/src/Umbraco.Core/Models/ContentEditing/UserDetail.cs b/src/Umbraco.Core/Models/ContentEditing/UserDetail.cs
index 88b31ee4a2..38ec7281a4 100644
--- a/src/Umbraco.Core/Models/ContentEditing/UserDetail.cs
+++ b/src/Umbraco.Core/Models/ContentEditing/UserDetail.cs
@@ -59,4 +59,10 @@ public class UserDetail : UserProfile
     /// </summary>
     [DataMember(Name = "allowedSections")]
     public IEnumerable<string>? AllowedSections { get; set; }
+
+    /// <summary>
+    ///     A list of language culcure codes the user is allowed to view.
+    /// </summary>
+    [DataMember(Name = "allowedLanguageIds")]
+    public IEnumerable<int>? AllowedLanguageIds { get; set; }
 }
diff --git a/src/Umbraco.Core/Models/Mapping/UserMapDefinition.cs b/src/Umbraco.Core/Models/Mapping/UserMapDefinition.cs
index 3a04f118be..9174ee7004 100644
--- a/src/Umbraco.Core/Models/Mapping/UserMapDefinition.cs
+++ b/src/Umbraco.Core/Models/Mapping/UserMapDefinition.cs
@@ -440,6 +440,7 @@ public class UserMapDefinition : IMapDefinition
     private void Map(IUser source, UserDetail target, MapperContext context)
     {
         target.AllowedSections = source.AllowedSections;
+        target.AllowedLanguageIds = source.CalculateAllowedLanguageIds(_localizationService);
         target.Avatars = source.GetUserAvatarUrls(_appCaches.RuntimeCache, _mediaFileManager, _imageUrlGenerator);
         target.Culture = source.GetUserCulture(_textService, _globalSettings).ToString();
         target.Email = source.Email;
diff --git a/src/Umbraco.Core/Models/UserExtensions.cs b/src/Umbraco.Core/Models/UserExtensions.cs
index 87f91978e0..f17f6e4de0 100644
--- a/src/Umbraco.Core/Models/UserExtensions.cs
+++ b/src/Umbraco.Core/Models/UserExtensions.cs
@@ -188,6 +188,15 @@ public static class UserExtensions
     /// <summary>
     ///     Calculate start nodes, combining groups' and user's, and excluding what's in the bin
     /// </summary>
+    public static int[]? CalculateAllowedLanguageIds(this IUser user, ILocalizationService localizationService)
+    {
+        var hasAccessToAllLanguages = user.Groups.Any(x => x.HasAccessToAllLanguages);
+
+        return hasAccessToAllLanguages
+            ? localizationService.GetAllLanguages().Select(x => x.Id).ToArray()
+            : user.Groups.SelectMany(x => x.AllowedLanguages).Distinct().ToArray();
+    }
+
     public static int[]? CalculateContentStartNodeIds(this IUser user, IEntityService entityService, AppCaches appCaches)
     {
         var cacheKey = CacheKeys.UserAllContentStartNodesPrefix + user.Id;