diff --git a/extensions/package-manager/src/AllValidatorRules.php b/extensions/package-manager/src/AllValidatorRules.php
deleted file mode 100644
index e2d8757e75..0000000000
--- a/extensions/package-manager/src/AllValidatorRules.php
+++ /dev/null
@@ -1,31 +0,0 @@
-<?php
-
-/*
- * This file is part of Flarum.
- *
- * For detailed copyright and license information, please view the
- * LICENSE file that was distributed with this source code.
- */
-
-namespace Flarum\ExtensionManager;
-
-use Illuminate\Validation\Validator;
-
-/**
- * @todo: fix in 2.0
- */
-trait AllValidatorRules
-{
-    protected function makeValidator(array $attributes): Validator
-    {
-        $rules = $this->getRules();
-
-        $validator = $this->validator->make($attributes, $rules, $this->getMessages());
-
-        foreach ($this->configuration as $callable) {
-            $callable($this, $validator);
-        }
-
-        return $validator;
-    }
-}
diff --git a/extensions/package-manager/src/ConfigureAuthValidator.php b/extensions/package-manager/src/ConfigureAuthValidator.php
index 14a9a03ed4..528a12c403 100644
--- a/extensions/package-manager/src/ConfigureAuthValidator.php
+++ b/extensions/package-manager/src/ConfigureAuthValidator.php
@@ -13,7 +13,7 @@
 
 class ConfigureAuthValidator extends AbstractValidator
 {
-    use AllValidatorRules;
+    protected bool $validateMissingKeys = true;
 
     protected array $rules = [
         'github-oauth' => ['sometimes', 'array'],
diff --git a/extensions/package-manager/src/ConfigureComposerValidator.php b/extensions/package-manager/src/ConfigureComposerValidator.php
index 6292e5539c..a58a172d08 100644
--- a/extensions/package-manager/src/ConfigureComposerValidator.php
+++ b/extensions/package-manager/src/ConfigureComposerValidator.php
@@ -13,7 +13,7 @@
 
 class ConfigureComposerValidator extends AbstractValidator
 {
-    use AllValidatorRules;
+    protected bool $validateMissingKeys = true;
 
     protected array $rules = [
         'minimum-stability' => ['sometimes', 'in:stable,RC,beta,alpha,dev'],
diff --git a/framework/core/src/Foundation/AbstractValidator.php b/framework/core/src/Foundation/AbstractValidator.php
index 788b85a7c0..0e4048827a 100644
--- a/framework/core/src/Foundation/AbstractValidator.php
+++ b/framework/core/src/Foundation/AbstractValidator.php
@@ -10,7 +10,8 @@
 namespace Flarum\Foundation;
 
 use Flarum\Locale\TranslatorInterface;
-use Illuminate\Support\Arr;
+use Illuminate\Support\Collection;
+use Illuminate\Support\Str;
 use Illuminate\Validation\Factory;
 use Illuminate\Validation\ValidationException;
 use Illuminate\Validation\Validator;
@@ -22,13 +23,12 @@ abstract class AbstractValidator
      */
     protected array $configuration = [];
 
-    /**
-     * @var array
-     */
     protected array $rules = [];
 
     protected ?Validator $laravelValidator = null;
 
+    protected bool $validateMissingKeys = false;
+
     public function __construct(
         protected Factory $validator,
         protected TranslatorInterface $translator
@@ -54,6 +54,16 @@ public function assertValid(array $attributes): void
         }
     }
 
+    /**
+     * Whether to validate missing keys or to only validate provided data keys.
+     */
+    public function validateMissingKeys(bool $validateMissingKeys = true): static
+    {
+        $this->validateMissingKeys = $validateMissingKeys;
+
+        return $this;
+    }
+
     public function prepare(array $attributes): static
     {
         $this->laravelValidator ??= $this->makeValidator($attributes);
@@ -71,6 +81,27 @@ protected function getRules(): array
         return $this->rules;
     }
 
+    protected function getActiveRules(array $attributes): array
+    {
+        $rules = $this->getRules();
+
+        if ($this->validateMissingKeys) {
+            return $rules;
+        }
+
+        return Collection::make($rules)
+            ->filter(function (mixed $rule, string $key) use ($attributes) {
+                foreach ($attributes as $attributeKey => $attributeValue) {
+                    if ($attributeKey === $key || Str::startsWith($key, $attributeKey.'.')) {
+                        return true;
+                    }
+                }
+
+                return false;
+            })
+            ->all();
+    }
+
     protected function getMessages(): array
     {
         return [];
@@ -78,7 +109,7 @@ protected function getMessages(): array
 
     protected function makeValidator(array $attributes): Validator
     {
-        $rules = Arr::only($this->getRules(), array_keys($attributes));
+        $rules = $this->getActiveRules($attributes);
 
         $validator = $this->validator->make($attributes, $rules, $this->getMessages());
 
diff --git a/framework/core/tests/integration/extenders/ValidatorTest.php b/framework/core/tests/integration/extenders/ValidatorTest.php
index eafaf4dae0..01bf94e6cd 100644
--- a/framework/core/tests/integration/extenders/ValidatorTest.php
+++ b/framework/core/tests/integration/extenders/ValidatorTest.php
@@ -18,7 +18,7 @@
 
 class ValidatorTest extends TestCase
 {
-    private function extendToRequireLongPassword()
+    private function extendToRequireLongPassword(): void
     {
         $this->extend((new Extend\Validator(CustomUserValidator::class))->configure(function ($flarumValidator, $validator) {
             $validator->setRules([
@@ -30,7 +30,7 @@ private function extendToRequireLongPassword()
         }));
     }
 
-    private function extendToRequireLongPasswordViaInvokableClass()
+    private function extendToRequireLongPasswordViaInvokableClass(): void
     {
         $this->extend((new Extend\Validator(CustomUserValidator::class))->configure(CustomValidatorClass::class));
     }
@@ -74,6 +74,51 @@ public function custom_validation_rule_doesnt_affect_other_validators()
         // If we have gotten this far, no validation exception has been thrown, so the test is successful.
         $this->assertTrue(true);
     }
+
+    #[Test]
+    public function validator_only_validates_provided_data_by_default()
+    {
+        /** @var SecondCustomValidator $validator */
+        $validator = $this->app()->getContainer()->make(SecondCustomValidator::class);
+
+        $validator->assertValid([
+            'my_key' => 'value',
+        ]);
+
+        // If we have gotten this far, no validation exception has been thrown, so the test is successful.
+        $this->assertTrue(true);
+    }
+
+    #[Test]
+    public function validator_includes_path_based_rules()
+    {
+        /** @var SecondCustomValidator $validator */
+        $validator = $this->app()->getContainer()->make(SecondCustomValidator::class);
+
+        $this->expectException(ValidationException::class);
+
+        $validator->assertValid([
+            'my_key' => 'value',
+            'my_third_key' => [null],
+        ]);
+    }
+
+    #[Test]
+    public function validator_can_validate_missing_keys()
+    {
+        /** @var SecondCustomValidator $validator */
+        $validator = $this->app()->getContainer()->make(SecondCustomValidator::class)->validateMissingKeys();
+
+        $this->expectException(ValidationException::class);
+
+        $validator->validateMissingKeys()->assertValid([
+            'my_key' => 'value',
+            'my_third_key' => [
+                '2021-01-01 00:00:00',
+                '2021-01-02 00:00:00'
+            ]
+        ]);
+    }
 }
 
 class CustomValidatorClass
@@ -142,3 +187,13 @@ class CustomValidator extends AbstractValidator
         'name_plural' => ['required']
     ];
 }
+
+class SecondCustomValidator extends AbstractValidator
+{
+    protected array $rules = [
+        'my_key' => ['required'],
+        'my_other_key' => ['required'],
+        'my_third_key' => ['required', 'array'],
+        'my_third_key.*' => ['required', 'date']
+    ];
+}