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date: Mon, 13 Oct 2025 22:36:01 GMT
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diff --git a/src/wp-includes/ms-settings.php b/src/wp-includes/ms-settings.php
index 6824895880f8b..3b7fd6d32eb0d 100644
--- a/src/wp-includes/ms-settings.php
+++ b/src/wp-includes/ms-settings.php
@@ -54,13 +54,21 @@
// have not been populated in the global scope through something like `sunrise.php`.
if ( ! isset( $current_site ) || ! isset( $current_blog ) ) {
- $domain = strtolower( stripslashes( $_SERVER['HTTP_HOST'] ) );
- if ( ':80' === substr( $domain, -3 ) ) {
- $domain = substr( $domain, 0, -3 );
- $_SERVER['HTTP_HOST'] = substr( $_SERVER['HTTP_HOST'], 0, -3 );
- } elseif ( ':443' === substr( $domain, -4 ) ) {
- $domain = substr( $domain, 0, -4 );
- $_SERVER['HTTP_HOST'] = substr( $_SERVER['HTTP_HOST'], 0, -4 );
+ $domain = 'notdefined';
+
+ if ( isset( $_SERVER['SERVER_NAME'] ) && ! empty( $_SERVER['SERVER_NAME'] ) ) {
+ $domain = $_SERVER['SERVER_NAME'];
+ }
+
+ if ( isset( $_SERVER['HTTP_HOST'] ) ) {
+ $domain = strtolower( stripslashes( $_SERVER['HTTP_HOST'] ) );
+ if ( ':80' === substr( $domain, -3 ) ) {
+ $domain = substr( $domain, 0, -3 );
+ $_SERVER['HTTP_HOST'] = substr( $_SERVER['HTTP_HOST'], 0, -3 );
+ } elseif ( ':443' === substr( $domain, -4 ) ) {
+ $domain = substr( $domain, 0, -4 );
+ $_SERVER['HTTP_HOST'] = substr( $_SERVER['HTTP_HOST'], 0, -4 );
+ }
}
$path = stripslashes( $_SERVER['REQUEST_URI'] );