diff --git a/SchengenVisaApi/ApplicationLayer/Services/Users/Requests/Validation/ChangeUserAuthDataRequestValidator.cs b/SchengenVisaApi/ApplicationLayer/Services/Users/Requests/Validation/ChangeUserAuthDataRequestValidator.cs
index e824e77..e858422 100644
--- a/SchengenVisaApi/ApplicationLayer/Services/Users/Requests/Validation/ChangeUserAuthDataRequestValidator.cs
+++ b/SchengenVisaApi/ApplicationLayer/Services/Users/Requests/Validation/ChangeUserAuthDataRequestValidator.cs
@@ -7,6 +7,9 @@ namespace ApplicationLayer.Services.Users.Requests.Validation
     {
         public ChangeUserAuthDataRequestValidator()
         {
+            RuleFor(r => r.UserId)
+                .NotEmpty();
+
             RuleFor(r => r.NewAuthData)
                 .NotEmpty();
 
diff --git a/SchengenVisaApi/VisaApiTests/Fakers/Common/ChangeAuthDataFaker.cs b/SchengenVisaApi/VisaApiTests/Fakers/Common/ChangeAuthDataFaker.cs
new file mode 100644
index 0000000..fa000f0
--- /dev/null
+++ b/SchengenVisaApi/VisaApiTests/Fakers/Common/ChangeAuthDataFaker.cs
@@ -0,0 +1,15 @@
+using ApplicationLayer.Services.Users.Models;
+using Bogus;
+
+namespace VisaApi.Fakers.Common
+{
+    public sealed class ChangeAuthDataFaker : Faker<ChangeAuthData>
+    {
+        public ChangeAuthDataFaker()
+        {
+            RuleFor(a => a.Email, f => f.Internet.Email());
+
+            RuleFor(a => a.Password, f => f.Internet.Password());
+        }
+    }
+}
diff --git a/SchengenVisaApi/VisaApiTests/Fakers/Users/Requests/ChangeUserAuthDataRequestFaker.cs b/SchengenVisaApi/VisaApiTests/Fakers/Users/Requests/ChangeUserAuthDataRequestFaker.cs
new file mode 100644
index 0000000..dce8164
--- /dev/null
+++ b/SchengenVisaApi/VisaApiTests/Fakers/Users/Requests/ChangeUserAuthDataRequestFaker.cs
@@ -0,0 +1,16 @@
+using ApplicationLayer.Services.Users.Requests;
+using Bogus;
+using VisaApi.Fakers.Common;
+
+namespace VisaApi.Fakers.Users.Requests
+{
+    public sealed class ChangeUserAuthDataRequestFaker : Faker<ChangeUserAuthDataRequest>
+    {
+        private static ChangeAuthDataFaker changeAuthDataFaker = new();
+
+        public ChangeUserAuthDataRequestFaker()
+        {
+            CustomInstantiator(_ => new(Guid.NewGuid(), changeAuthDataFaker.Generate()));
+        }
+    }
+}
diff --git a/SchengenVisaApi/VisaApiTests/Fakers/Common/UserFaker.cs b/SchengenVisaApi/VisaApiTests/Fakers/Users/UserFaker.cs
similarity index 91%
rename from SchengenVisaApi/VisaApiTests/Fakers/Common/UserFaker.cs
rename to SchengenVisaApi/VisaApiTests/Fakers/Users/UserFaker.cs
index 1e5f271..11f7b40 100644
--- a/SchengenVisaApi/VisaApiTests/Fakers/Common/UserFaker.cs
+++ b/SchengenVisaApi/VisaApiTests/Fakers/Users/UserFaker.cs
@@ -1,7 +1,7 @@
 using Bogus;
 using Domains.Users;
 
-namespace VisaApi.Fakers.Common
+namespace VisaApi.Fakers.Users
 {
     /// <summary>
     /// Generates users
diff --git a/SchengenVisaApi/VisaApiTests/Tests/Application/Validation/Users/ChangeUserAuthDataRequestValidationTests.cs b/SchengenVisaApi/VisaApiTests/Tests/Application/Validation/Users/ChangeUserAuthDataRequestValidationTests.cs
new file mode 100644
index 0000000..59ad092
--- /dev/null
+++ b/SchengenVisaApi/VisaApiTests/Tests/Application/Validation/Users/ChangeUserAuthDataRequestValidationTests.cs
@@ -0,0 +1,37 @@
+using ApplicationLayer.Services.Users.Requests;
+using ApplicationLayer.Services.Users.Requests.Validation;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.Users.Requests;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.Users
+{
+    public class ChangeUserAuthDataRequestValidationTests
+    {
+        private readonly static IValidator<ChangeUserAuthDataRequest> validator = new ChangeUserAuthDataRequestValidator();
+        private readonly static ChangeUserAuthDataRequestFaker faker = new();
+
+        /// <summary>
+        /// Test for <see cref="ChangeUserAuthDataRequest"/> validator that should return validation error for empty auth data
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyAuthDataShouldReturnError()
+        {
+            var request = faker.Generate();
+            request.NewAuthData = null!;
+            NullReferenceException? result = null;
+
+            try
+            {
+                await validator.ValidateAsync(request);
+            }
+            catch (Exception e)
+            {
+                result = e as NullReferenceException;
+            }
+
+            result.Should().NotBeNull();
+        }
+    }
+}
diff --git a/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/ApplicantsRepositoryTests.cs b/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/ApplicantsRepositoryTests.cs
index 23099a6..e5eb0b2 100644
--- a/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/ApplicantsRepositoryTests.cs
+++ b/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/ApplicantsRepositoryTests.cs
@@ -5,7 +5,7 @@ using Infrastructure.Database;
 using Infrastructure.Database.Applicants.Repositories;
 using Infrastructure.Database.Applicants.Repositories.Exceptions;
 using VisaApi.Fakers.Applicants;
-using VisaApi.Fakers.Common;
+using VisaApi.Fakers.Users;
 using VisaApi.Services;
 using Xunit;
 
diff --git a/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/UsersRepositoryTests.cs b/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/UsersRepositoryTests.cs
index 3fc3e9a..50227d7 100644
--- a/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/UsersRepositoryTests.cs
+++ b/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/UsersRepositoryTests.cs
@@ -4,7 +4,7 @@ using Domains.Users;
 using FluentAssertions;
 using Infrastructure.Database;
 using Infrastructure.Database.Users.Repositories;
-using VisaApi.Fakers.Common;
+using VisaApi.Fakers.Users;
 using Xunit;
 
 namespace VisaApi.Tests.Infrastructure.Database.Repositories
diff --git a/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/VisaApplicationsRepositoryTests.cs b/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/VisaApplicationsRepositoryTests.cs
index 80de943..b034dd9 100644
--- a/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/VisaApplicationsRepositoryTests.cs
+++ b/SchengenVisaApi/VisaApiTests/Tests/Infrastructure/Database/Repositories/VisaApplicationsRepositoryTests.cs
@@ -6,7 +6,7 @@ using Infrastructure.Database;
 using Infrastructure.Database.VisaApplications.Repositories;
 using Infrastructure.Database.VisaApplications.Repositories.Exceptions;
 using VisaApi.Fakers.Applicants;
-using VisaApi.Fakers.Common;
+using VisaApi.Fakers.Users;
 using VisaApi.Fakers.VisaApplications;
 using VisaApi.Services;
 using Xunit;