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diff --git a/web/core/lib/Drupal/Core/Security/RequestSanitizer.php b/web/core/lib/Drupal/Core/Security/RequestSanitizer.php
new file mode 100644
index 000000000..8ba17b95c
--- /dev/null
+++ b/web/core/lib/Drupal/Core/Security/RequestSanitizer.php
@@ -0,0 +1,99 @@
+<?php
+
+namespace Drupal\Core\Security;
+
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Sanitizes user input.
+ */
+class RequestSanitizer {
+
+  /**
+   * Request attribute to mark the request as sanitized.
+   */
+  const SANITIZED = '_drupal_request_sanitized';
+
+  /**
+   * The name of the setting that configures the whitelist.
+   */
+  const SANITIZE_WHITELIST = 'sanitize_input_whitelist';
+
+  /**
+   * The name of the setting that determines if sanitized keys are logged.
+   */
+  const SANITIZE_LOG = 'sanitize_input_logging';
+
+  /**
+   * Strips dangerous keys from user input.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The incoming request to sanitize.
+   * @param string[] $whitelist
+   *   An array of keys to whitelist as safe. See default.settings.php.
+   * @param bool $log_sanitized_keys
+   *   (optional) Set to TRUE to log an keys that are sanitized.
+   *
+   * @return \Symfony\Component\HttpFoundation\Request
+   *   The sanitized request.
+   */
+  public static function sanitize(Request $request, $whitelist, $log_sanitized_keys = FALSE) {
+    if (!$request->attributes->get(self::SANITIZED, FALSE)) {
+      // Process query string parameters.
+      $get_sanitized_keys = [];
+      $request->query->replace(static::stripDangerousValues($request->query->all(), $whitelist, $get_sanitized_keys));
+      if ($log_sanitized_keys && !empty($get_sanitized_keys)) {
+        trigger_error(sprintf('Potentially unsafe keys removed from query string parameters (GET): %s', implode(', ', $get_sanitized_keys)));
+      }
+
+      // Request body parameters.
+      $post_sanitized_keys = [];
+      $request->request->replace(static::stripDangerousValues($request->request->all(), $whitelist, $post_sanitized_keys));
+      if ($log_sanitized_keys && !empty($post_sanitized_keys)) {
+        trigger_error(sprintf('Potentially unsafe keys removed from request body parameters (POST): %s', implode(', ', $post_sanitized_keys)));
+      }
+
+      // Cookie parameters.
+      $cookie_sanitized_keys = [];
+      $request->cookies->replace(static::stripDangerousValues($request->cookies->all(), $whitelist, $cookie_sanitized_keys));
+      if ($log_sanitized_keys && !empty($cookie_sanitized_keys)) {
+        trigger_error(sprintf('Potentially unsafe keys removed from cookie parameters: %s', implode(', ', $cookie_sanitized_keys)));
+      }
+
+      if (!empty($get_sanitized_keys) || !empty($post_sanitized_keys) || !empty($cookie_sanitized_keys)) {
+        $request->overrideGlobals();
+      }
+      $request->attributes->set(self::SANITIZED, TRUE);
+    }
+    return $request;
+  }
+
+  /**
+   * Strips dangerous keys from $input.
+   *
+   * @param mixed $input
+   *   The input to sanitize.
+   * @param string[] $whitelist
+   *   An array of keys to whitelist as safe.
+   * @param string[] $sanitized_keys
+   *   An array of keys that have been removed.
+   *
+   * @return mixed
+   *   The sanitized input.
+   */
+  protected static function stripDangerousValues($input, array $whitelist, array &$sanitized_keys) {
+    if (is_array($input)) {
+      foreach ($input as $key => $value) {
+        if ($key !== '' && $key[0] === '#' && !in_array($key, $whitelist, TRUE)) {
+          unset($input[$key]);
+          $sanitized_keys[] = $key;
+        }
+        else {
+          $input[$key] = static::stripDangerousValues($input[$key], $whitelist, $sanitized_keys);
+        }
+      }
+    }
+    return $input;
+  }
+
+}