diff --git a/app/Http/Controllers/Admin/AdminAnidbController.php b/app/Http/Controllers/Admin/AdminAnidbController.php
index 4f93b62dd..3221f10fe 100644
--- a/app/Http/Controllers/Admin/AdminAnidbController.php
+++ b/app/Http/Controllers/Admin/AdminAnidbController.php
@@ -23,7 +23,7 @@ class AdminAnidbController extends BasePageController
         $anidbService = new AnidbService;
         $title = $meta_title = 'AniDB List';
 
-        $animetitle = $request->input('animetitle', '');
+        $animetitle = $this->scalarInput($request, 'animetitle');
         $anidblist = $anidbService->getAnimeRange($animetitle);
 
         return view('admin.anidb.index', compact('anidblist', 'animetitle', 'title', 'meta_title'));
diff --git a/app/Http/Controllers/Admin/AdminCategoryRegexesController.php b/app/Http/Controllers/Admin/AdminCategoryRegexesController.php
index 4ca6a090e..ba1681cf5 100644
--- a/app/Http/Controllers/Admin/AdminCategoryRegexesController.php
+++ b/app/Http/Controllers/Admin/AdminCategoryRegexesController.php
@@ -23,7 +23,7 @@ class AdminCategoryRegexesController extends BasePageController
 
         $meta_title = $title = 'Category Regex List';
 
-        $group = $request->has('group') && ! empty($request->input('group')) ? $request->input('group') : '';
+        $group = $this->scalarInput($request, 'group');
         $regex = $regexes->getRegex($group);
 
         $this->viewData = array_merge($this->viewData, [
diff --git a/app/Http/Controllers/Admin/AdminCollectionRegexesController.php b/app/Http/Controllers/Admin/AdminCollectionRegexesController.php
index 80fa5ce86..08fbce416 100644
--- a/app/Http/Controllers/Admin/AdminCollectionRegexesController.php
+++ b/app/Http/Controllers/Admin/AdminCollectionRegexesController.php
@@ -23,7 +23,7 @@ class AdminCollectionRegexesController extends BasePageController
 
         $meta_title = $title = 'Collections Regex List';
 
-        $group = ($request->has('group') && ! empty($request->input('group')) ? $request->input('group') : '');
+        $group = $this->scalarInput($request, 'group');
         $regex = $regexes->getRegex($group);
 
         $this->viewData = array_merge($this->viewData, [
diff --git a/app/Http/Controllers/Admin/AdminGameController.php b/app/Http/Controllers/Admin/AdminGameController.php
index f692d811d..50e7e56f0 100644
--- a/app/Http/Controllers/Admin/AdminGameController.php
+++ b/app/Http/Controllers/Admin/AdminGameController.php
@@ -23,7 +23,7 @@ class AdminGameController extends BasePageController
         $meta_title = $title = 'Game List';
 
         // Get search parameter
-        $search = $request->input('gamesearch', '');
+        $search = $this->scalarInput($request, 'gamesearch');
 
         if (! empty($search)) {
             $gamelist = $game->getRange($search);
diff --git a/app/Http/Controllers/Admin/AdminInvitationController.php b/app/Http/Controllers/Admin/AdminInvitationController.php
index 9820fd995..f13f4822f 100644
--- a/app/Http/Controllers/Admin/AdminInvitationController.php
+++ b/app/Http/Controllers/Admin/AdminInvitationController.php
@@ -33,10 +33,10 @@ class AdminInvitationController extends BasePageController
         $meta_title = $title = 'Invitation Management';
 
         // Get filter parameters
-        $status = $request->get('status', '');
-        $invited_by = $request->get('invited_by', '');
-        $email = $request->get('email', '');
-        $orderBy = $request->get('ob', 'created_at_desc');
+        $status = $this->scalarInput($request, 'status');
+        $invited_by = $this->scalarInput($request, 'invited_by');
+        $email = $this->scalarInput($request, 'email');
+        $orderBy = $this->scalarInput($request, 'ob', 'created_at_desc');
 
         // Build query
         $query = Invitation::with(['invitedBy', 'usedBy']);
diff --git a/app/Http/Controllers/Admin/AdminMovieController.php b/app/Http/Controllers/Admin/AdminMovieController.php
index a532a9315..a536d5fe8 100644
--- a/app/Http/Controllers/Admin/AdminMovieController.php
+++ b/app/Http/Controllers/Admin/AdminMovieController.php
@@ -33,10 +33,10 @@ class AdminMovieController extends BasePageController
      */
     public function index(Request $request): mixed
     {
-        $lastSearch = $request->input('moviesearch', '');
+        $lastSearch = $this->scalarInput($request, 'moviesearch');
 
         if ($request->has('moviesearch')) {
-            $movielist = MovieInfo::getAll($request->input('moviesearch'));
+            $movielist = MovieInfo::getAll($lastSearch);
         } else {
             $movielist = MovieInfo::getAll();
         }
diff --git a/app/Http/Controllers/Admin/AdminMusicController.php b/app/Http/Controllers/Admin/AdminMusicController.php
index 81ab58835..f7c51c18b 100644
--- a/app/Http/Controllers/Admin/AdminMusicController.php
+++ b/app/Http/Controllers/Admin/AdminMusicController.php
@@ -21,7 +21,7 @@ class AdminMusicController extends BasePageController
         $meta_title = $title = 'Music List';
 
         // Get search parameter
-        $search = $request->input('musicsearch', '');
+        $search = $this->scalarInput($request, 'musicsearch');
 
         if (! empty($search)) {
             $musicList = getRange('musicinfo');
diff --git a/app/Http/Controllers/Admin/AdminPredbController.php b/app/Http/Controllers/Admin/AdminPredbController.php
index d975ea28f..dd7b26feb 100644
--- a/app/Http/Controllers/Admin/AdminPredbController.php
+++ b/app/Http/Controllers/Admin/AdminPredbController.php
@@ -18,7 +18,7 @@ class AdminPredbController extends BasePageController
     {
         $this->setAdminPrefs();
 
-        $lastSearch = $request->input('presearch', '');
+        $lastSearch = $this->scalarInput($request, 'presearch');
 
         if ($lastSearch) {
             $results = Predb::getAll($lastSearch);
diff --git a/app/Http/Controllers/Admin/AdminReleaseNamingRegexesController.php b/app/Http/Controllers/Admin/AdminReleaseNamingRegexesController.php
index c28ada27f..99828d315 100644
--- a/app/Http/Controllers/Admin/AdminReleaseNamingRegexesController.php
+++ b/app/Http/Controllers/Admin/AdminReleaseNamingRegexesController.php
@@ -23,10 +23,7 @@ class AdminReleaseNamingRegexesController extends BasePageController
 
         $meta_title = $title = 'Release Naming Regex List';
 
-        $group = '';
-        if ($request->has('group') && ! empty($request->input('group'))) {
-            $group = $request->input('group');
-        }
+        $group = $this->scalarInput($request, 'group');
         $regex = $regexes->getRegex($group);
 
         $this->viewData = array_merge($this->viewData, [
diff --git a/app/Http/Controllers/Admin/AdminShowsController.php b/app/Http/Controllers/Admin/AdminShowsController.php
index 1437b7abb..cad93c266 100644
--- a/app/Http/Controllers/Admin/AdminShowsController.php
+++ b/app/Http/Controllers/Admin/AdminShowsController.php
@@ -24,7 +24,7 @@ class AdminShowsController extends BasePageController
 
         $meta_title = $title = 'TV Shows List';
 
-        $showname = $request->input('showname', '');
+        $showname = $this->scalarInput($request, 'showname');
         $tvshowlist = Video::getRange($showname);
 
         return view('admin.shows.index', compact('tvshowlist', 'showname', 'title', 'meta_title'));
diff --git a/app/Http/Controllers/Admin/AdminUserRoleHistoryController.php b/app/Http/Controllers/Admin/AdminUserRoleHistoryController.php
index d82754b64..e00537262 100644
--- a/app/Http/Controllers/Admin/AdminUserRoleHistoryController.php
+++ b/app/Http/Controllers/Admin/AdminUserRoleHistoryController.php
@@ -24,42 +24,51 @@ class AdminUserRoleHistoryController extends BasePageController
         // Get all roles for filter
         $roles = Role::all()->pluck('name', 'id')->toArray();
 
+        $filters = [
+            'user_id' => $this->scalarInput($request, 'user_id'),
+            'username' => $this->scalarInput($request, 'username'),
+            'role_id' => $this->scalarInput($request, 'role_id'),
+            'change_reason' => $this->scalarInput($request, 'change_reason'),
+            'date_from' => $this->scalarInput($request, 'date_from'),
+            'date_to' => $this->scalarInput($request, 'date_to'),
+        ];
+
         // Build query
         $query = UserRoleHistory::with(['user', 'oldRole', 'newRole', 'changedByUser'])
             ->orderBy('created_at', 'desc');
 
         // Apply filters
-        if ($request->has('user_id') && ! empty($request->input('user_id'))) {
-            $query->where('user_id', $request->input('user_id'));
+        if ($filters['user_id'] !== '') {
+            $query->where('user_id', $filters['user_id']);
         }
 
-        if ($request->has('username') && ! empty($request->input('username'))) {
-            $query->whereHas('user', function ($q) use ($request) {
-                $q->where('username', 'like', '%'.$request->input('username').'%');
+        if ($filters['username'] !== '') {
+            $query->whereHas('user', function ($q) use ($filters) {
+                $q->where('username', 'like', '%'.$filters['username'].'%');
             });
         }
 
-        if ($request->has('role_id') && ! empty($request->input('role_id'))) {
-            $query->where(function ($q) use ($request) {
-                $q->where('old_role_id', $request->input('role_id'))
-                    ->orWhere('new_role_id', $request->input('role_id'));
+        if ($filters['role_id'] !== '') {
+            $query->where(function ($q) use ($filters) {
+                $q->where('old_role_id', $filters['role_id'])
+                    ->orWhere('new_role_id', $filters['role_id']);
             });
         }
 
-        if ($request->has('change_reason') && ! empty($request->input('change_reason'))) {
-            $query->where('change_reason', 'like', '%'.$request->input('change_reason').'%');
+        if ($filters['change_reason'] !== '') {
+            $query->where('change_reason', 'like', '%'.$filters['change_reason'].'%');
         }
 
-        if ($request->has('date_from') && ! empty($request->input('date_from'))) {
-            $query->where('created_at', '>=', $request->input('date_from').' 00:00:00');
+        if ($filters['date_from'] !== '') {
+            $query->where('created_at', '>=', $filters['date_from'].' 00:00:00');
         }
 
-        if ($request->has('date_to') && ! empty($request->input('date_to'))) {
-            $query->where('created_at', '<=', $request->input('date_to').' 23:59:59');
+        if ($filters['date_to'] !== '') {
+            $query->where('created_at', '<=', $filters['date_to'].' 23:59:59');
         }
 
         // Pagination
-        $page = $request->has('page') && is_numeric($request->input('page')) ? $request->input('page') : 1;
+        $page = $this->resolvePage($request);
         $perPage = config('nntmux.items_per_page', 50);
 
         $results = $query->paginate($perPage, ['*'], 'page', $page);
@@ -69,14 +78,7 @@ class AdminUserRoleHistoryController extends BasePageController
             'meta_title' => $meta_title,
             'history' => $results,
             'roles' => $roles,
-            'filters' => [
-                'user_id' => $request->input('user_id', ''),
-                'username' => $request->input('username', ''),
-                'role_id' => $request->input('role_id', ''),
-                'change_reason' => $request->input('change_reason', ''),
-                'date_from' => $request->input('date_from', ''),
-                'date_to' => $request->input('date_to', ''),
-            ],
+            'filters' => $filters,
         ]);
 
         return view('admin.user-role-history.index', $this->viewData);
diff --git a/app/Http/Controllers/Admin/DeletedUsersController.php b/app/Http/Controllers/Admin/DeletedUsersController.php
index 618a9f216..b6276f484 100644
--- a/app/Http/Controllers/Admin/DeletedUsersController.php
+++ b/app/Http/Controllers/Admin/DeletedUsersController.php
@@ -25,14 +25,14 @@ class DeletedUsersController extends BasePageController
         $this->setAdminPrefs();
 
         // Filters
-        $username = $request->input('username', '');
-        $email = $request->input('email', '');
-        $host = $request->input('host', '');
-        $orderBy = $request->filled('ob') ? $request->input('ob') : 'deleted_at_desc';
-        $createdFrom = $request->input('created_from', '');
-        $createdTo = $request->input('created_to', '');
-        $deletedFrom = $request->input('deleted_from', '');
-        $deletedTo = $request->input('deleted_to', '');
+        $username = $this->scalarInput($request, 'username');
+        $email = $this->scalarInput($request, 'email');
+        $host = $this->scalarInput($request, 'host');
+        $orderBy = $this->scalarInput($request, 'ob', 'deleted_at_desc');
+        $createdFrom = $this->scalarInput($request, 'created_from');
+        $createdTo = $this->scalarInput($request, 'created_to');
+        $deletedFrom = $this->scalarInput($request, 'deleted_from');
+        $deletedTo = $this->scalarInput($request, 'deleted_to');
 
         $deletedUsers = User::onlyTrashed()
             ->leftJoin('roles', 'roles.id', '=', 'users.roles_id')
diff --git a/tests/Unit/UserViewRequestInputTest.php b/tests/Unit/UserViewRequestInputTest.php
index 256a57fae..e46c2f8cb 100644
--- a/tests/Unit/UserViewRequestInputTest.php
+++ b/tests/Unit/UserViewRequestInputTest.php
@@ -4,9 +4,11 @@ namespace Tests\Unit;
 
 use App\Http\Controllers\BasePageController;
 use App\Http\Controllers\SearchController;
+use Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull;
 use Illuminate\Http\Request;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
+use Symfony\Component\HttpFoundation\Response;
 
 class UserViewRequestInputTest extends TestCase
 {
@@ -44,6 +46,20 @@ class UserViewRequestInputTest extends TestCase
         $this->assertSame(80, $controller->offset(5, 20));
     }
 
+    public function test_scalar_input_normalizes_an_explicitly_empty_query_after_http_middleware(): void
+    {
+        $request = Request::create('/admin/anidb-list', 'GET', ['animetitle' => '']);
+
+        (new ConvertEmptyStringsToNull)->handle(
+            $request,
+            static fn (Request $request): Response => new Response,
+        );
+
+        $this->assertNull($request->input('animetitle'));
+        $this->assertSame('', $this->controller()->scalar($request, 'animetitle'));
+        $this->assertSame('all', $this->controller()->scalar($request, 'animetitle', 'all'));
+    }
+
     public function test_search_category_resolution_rejects_malformed_category_values(): void
     {
         $reflection = new ReflectionClass(SearchController::class);
@@ -74,9 +90,9 @@ class UserViewRequestInputTest extends TestCase
                 return $this->resolveOrderBy($request, $ordering);
             }
 
-            public function scalar(Request $request, string $key): string
+            public function scalar(Request $request, string $key, string $default = ''): string
             {
-                return $this->scalarInput($request, $key);
+                return $this->scalarInput($request, $key, $default);
             }
 
             public function integer(Request $request, string $key, int $default): int