1 files changed, 3 insertions, 2 deletions
diff --git a/core/Url.php b/core/Url.php
index 3a52cc9806..376138b608 100644
--- a/core/Url.php
+++ b/core/Url.php
@@ -630,8 +630,9 @@ class Url
                     return true;
                 }
 
-                if (Common::stringEndsWith($siteHost, $host)) {
-                    return;
+                if (Common::stringEndsWith($siteHost, '.' . $host)) {
+                    // allow subdomains
+                    return true;
                 }
             }
         }