diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-admin/includes/class-wp-automatic-updater.php
--- a/wp/wp-admin/includes/class-wp-automatic-updater.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-admin/includes/class-wp-automatic-updater.php	Fri Sep 05 18:52:52 2025 +0200
@@ -752,7 +752,7 @@
 
 		// Send debugging email to admin for all development installations.
 		if ( ! empty( $this->update_results ) ) {
-			$development_version = str_contains( get_bloginfo( 'version' ), '-' );
+			$development_version = str_contains( wp_get_wp_version(), '-' );
 
 			/**
 			 * Filters whether to send a debugging email for each automatic background update.
@@ -795,7 +795,7 @@
 	 * @param object $update_result The result of the core update. Includes the update offer and result.
 	 */
 	protected function after_core_update( $update_result ) {
-		$wp_version = get_bloginfo( 'version' );
+		$wp_version = wp_get_wp_version();
 
 		$core_update = $update_result->item;
 		$result      = $update_result->result;
@@ -936,6 +936,14 @@
 			return;
 		}
 
+		$admin_user = get_user_by( 'email', get_site_option( 'admin_email' ) );
+
+		if ( $admin_user ) {
+			$switched_locale = switch_to_user_locale( $admin_user->ID );
+		} else {
+			$switched_locale = switch_to_locale( get_locale() );
+		}
+
 		switch ( $type ) {
 			case 'success': // We updated.
 				/* translators: Site updated notification email subject. 1: Site title, 2: WordPress version. */
@@ -1139,9 +1147,12 @@
 		$email = apply_filters( 'auto_core_update_email', $email, $type, $core_update, $result );
 
 		wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
+
+		if ( $switched_locale ) {
+			restore_previous_locale();
+		}
 	}
 
-
 	/**
 	 * Checks whether an email should be sent after attempting plugin or theme updates.
 	 *
@@ -1255,6 +1266,14 @@
 			}
 		}
 
+		$admin_user = get_user_by( 'email', get_site_option( 'admin_email' ) );
+
+		if ( $admin_user ) {
+			$switched_locale = switch_to_user_locale( $admin_user->ID );
+		} else {
+			$switched_locale = switch_to_locale( get_locale() );
+		}
+
 		$body               = array();
 		$successful_plugins = ( ! empty( $successful_updates['plugin'] ) );
 		$successful_themes  = ( ! empty( $successful_updates['theme'] ) );
@@ -1526,6 +1545,10 @@
 		if ( $result ) {
 			update_option( 'auto_plugin_theme_update_emails', $past_failure_emails );
 		}
+
+		if ( $switched_locale ) {
+			restore_previous_locale();
+		}
 	}
 
 	/**
@@ -1534,9 +1557,12 @@
 	 * @since 3.7.0
 	 */
 	protected function send_debug_email() {
-		$update_count = 0;
-		foreach ( $this->update_results as $type => $updates ) {
-			$update_count += count( $updates );
+		$admin_user = get_user_by( 'email', get_site_option( 'admin_email' ) );
+
+		if ( $admin_user ) {
+			$switched_locale = switch_to_user_locale( $admin_user->ID );
+		} else {
+			$switched_locale = switch_to_locale( get_locale() );
 		}
 
 		$body     = array();
@@ -1715,6 +1741,10 @@
 		$email = apply_filters( 'automatic_updates_debug_email', $email, $failures, $this->update_results );
 
 		wp_mail( $email['to'], wp_specialchars_decode( $email['subject'] ), $email['body'], $email['headers'] );
+
+		if ( $switched_locale ) {
+			restore_previous_locale();
+		}
 	}
 
 	/**