--- a/Classes/Error/PageErrorHandler/PageContentErrorHandler.php	2020-12-22 07:59:57.000000000 +0100
+++ b/Classes/Error/PageErrorHandler/PageContentErrorHandler.php	2021-02-15 10:19:38.000000000 +0100
@@ -29,6 +29,7 @@
 use TYPO3\CMS\Core\Site\Entity\SiteLanguage;
 use TYPO3\CMS\Core\Site\SiteFinder;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
+use GuzzleHttp\Cookie\CookieJar;

 /**
  * Renders the content of a page to be displayed (also in relation to language etc)
@@ -76,7 +77,10 @@
             $content = null;
             if ($resolvedUrl !== (string)$request->getUri()) {
                 try {
-                    $subResponse = GeneralUtility::makeInstance(RequestFactory::class)->request($resolvedUrl, 'GET');
+                    /** @var Site $requestedSite */
+                    $requestedSite = $request->getAttribute('site');
+                    $cookieJar = CookieJar::fromArray($request->getCookieParams(), $requestedSite->getBase()->getHost());
+                    $subResponse = GeneralUtility::makeInstance(RequestFactory::class)->request($resolvedUrl, 'GET', ['cookies' => $cookieJar]);
                 } catch (\Exception $e) {
                     throw new \RuntimeException('Error handler could not fetch error page "' . $resolvedUrl . '", reason: ' . $e->getMessage(), 1544172838);
                 }