--- typo3/cms-core/Classes/Routing/SiteMatcher.php
+++ typo3/cms-core/Classes/Routing/SiteMatcher.php
@@ -185,7 +185,7 @@
             // Add the site as entrypoint
             $uri = $site->getBase();
             $route = new Route(
-                ($uri->getPath() ?: '/') . '{tail}',
+                (rawurldecode($uri->getPath()) ?: '/') . '{tail}',
                 ['site' => $site, 'language' => null, 'tail' => ''],
                 array_filter(['tail' => '.*', 'port' => (string)$uri->getPort()]),
                 ['utf8' => true],
@@ -198,7 +198,7 @@
             foreach ($site->getAllLanguages() as $siteLanguage) {
                 $uri = $siteLanguage->getBase();
                 $route = new Route(
-                    ($uri->getPath() ?: '/') . '{tail}',
+                    (rawurldecode($uri->getPath()) ?: '/') . '{tail}',
                     ['site' => $site, 'language' => $siteLanguage, 'tail' => ''],
                     array_filter(['tail' => '.*', 'port' => (string)$uri->getPort()]),
                     ['utf8' => true],