diff --git a/src/license.txt b/src/license.txt
index 90cf5383fe5a4..a22eda8f3bbf4 100644
--- a/src/license.txt
+++ b/src/license.txt
@@ -1,6 +1,6 @@
 WordPress - Web publishing software
 
-Copyright 2011-2024 by the contributors
+Copyright 2011-2025 by the contributors
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
diff --git a/src/wp-content/themes/twentyeleven/readme.txt b/src/wp-content/themes/twentyeleven/readme.txt
index 16d4d11e26b57..f8d794b9b8a23 100644
--- a/src/wp-content/themes/twentyeleven/readme.txt
+++ b/src/wp-content/themes/twentyeleven/readme.txt
@@ -23,7 +23,7 @@ For more information about Twenty Eleven please go to https://codex.wordpress.or
 
 == Copyright ==
 
-Twenty Eleven WordPress Theme, Copyright 2011-2024 WordPress.org, Automattic Inc., and contributors.
+Twenty Eleven WordPress Theme, Copyright 2011-2025 WordPress.org, Automattic Inc., and contributors.
 Twenty Eleven is Distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentyfifteen/readme.txt b/src/wp-content/themes/twentyfifteen/readme.txt
index 358101e7a55af..2fd9ff16029ad 100644
--- a/src/wp-content/themes/twentyfifteen/readme.txt
+++ b/src/wp-content/themes/twentyfifteen/readme.txt
@@ -31,7 +31,7 @@ For more information about Twenty Fifteen please go to https://wordpress.org/doc
 
 == Copyright ==
 
-Twenty Fifteen WordPress Theme, Copyright 2014-2024 WordPress.org, Automattic Inc., and contributors.
+Twenty Fifteen WordPress Theme, Copyright 2014-2025 WordPress.org, Automattic Inc., and contributors.
 Twenty Fifteen is distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentyfourteen/readme.txt b/src/wp-content/themes/twentyfourteen/readme.txt
index a54226a83f7fb..af119167596ea 100644
--- a/src/wp-content/themes/twentyfourteen/readme.txt
+++ b/src/wp-content/themes/twentyfourteen/readme.txt
@@ -23,7 +23,7 @@ For more information about Twenty Fourteen please go to https://codex.wordpress.
 
 == Copyright ==
 
-Twenty Fourteen WordPress Theme, Copyright 2013-2024 WordPress.org, Automattic Inc., and contributors.
+Twenty Fourteen WordPress Theme, Copyright 2013-2025 WordPress.org, Automattic Inc., and contributors.
 Twenty Fourteen is Distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentynineteen/readme.txt b/src/wp-content/themes/twentynineteen/readme.txt
index d3ca13553e2d1..e30e9291c221d 100644
--- a/src/wp-content/themes/twentynineteen/readme.txt
+++ b/src/wp-content/themes/twentynineteen/readme.txt
@@ -25,7 +25,7 @@ For more information about Twenty Nineteen please go to https://wordpress.org/do
 
 == Copyright ==
 
-Twenty Nineteen WordPress Theme, Copyright 2018-2024 WordPress.org, and contributors.
+Twenty Nineteen WordPress Theme, Copyright 2018-2025 WordPress.org, and contributors.
 Twenty Nineteen is distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
@@ -147,7 +147,7 @@ Initial release
 
 == Resources ==
 * normalize.css, © 2012-2018 Nicolas Gallagher and Jonathan Neal, MIT
-* Underscores, © 2012-2024 Automattic, Inc., GNU GPL v2 or later
+* Underscores, © 2012-2025 Automattic, Inc., GNU GPL v2 or later
 * Bundled block pattern images:
 	* Abstract Background by HD Wallpapers, CC0. https://stocksnap.io/photo/abstract-background-0SRRVNMKBX
 	* Abstract Waves by HD Wallpapers, CC0. https://stocksnap.io/photo/abstract-waves-0KREGLTZQ3
diff --git a/src/wp-content/themes/twentyseventeen/readme.txt b/src/wp-content/themes/twentyseventeen/readme.txt
index c78ed84d89e3a..cc3246ea4d8e3 100644
--- a/src/wp-content/themes/twentyseventeen/readme.txt
+++ b/src/wp-content/themes/twentyseventeen/readme.txt
@@ -24,7 +24,7 @@ For more information about Twenty Seventeen please go to https://wordpress.org/d
 
 == Copyright ==
 
-Twenty Seventeen WordPress Theme, Copyright 2016-2024 WordPress.org, and contributors.
+Twenty Seventeen WordPress Theme, Copyright 2016-2025 WordPress.org, and contributors.
 Twenty Seventeen is distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentysixteen/readme.txt b/src/wp-content/themes/twentysixteen/readme.txt
index 6891502fe3b5e..e5a5a2776773d 100644
--- a/src/wp-content/themes/twentysixteen/readme.txt
+++ b/src/wp-content/themes/twentysixteen/readme.txt
@@ -30,7 +30,7 @@ For more information about Twenty Sixteen please go to https://wordpress.org/doc
 
 == Copyright ==
 
-Twenty Sixteen WordPress Theme, Copyright 2014-2024 WordPress.org, and contributors.
+Twenty Sixteen WordPress Theme, Copyright 2014-2025 WordPress.org, and contributors.
 Twenty Sixteen is distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentyten/readme.txt b/src/wp-content/themes/twentyten/readme.txt
index 1127216542e5d..f0e8c057cfb64 100644
--- a/src/wp-content/themes/twentyten/readme.txt
+++ b/src/wp-content/themes/twentyten/readme.txt
@@ -23,7 +23,7 @@ For more information about Twenty Ten theme please go to https://codex.wordpress
 
 == Copyright ==
 
-Twenty Ten WordPress Theme, Copyright 2010-2024 WordPress.org, Automattic Inc., and contributors.
+Twenty Ten WordPress Theme, Copyright 2010-2025 WordPress.org, Automattic Inc., and contributors.
 Twenty Ten is Distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentythirteen/readme.txt b/src/wp-content/themes/twentythirteen/readme.txt
index e02e6eae1cc07..94261e7c4c002 100644
--- a/src/wp-content/themes/twentythirteen/readme.txt
+++ b/src/wp-content/themes/twentythirteen/readme.txt
@@ -23,7 +23,7 @@ For more information about Twenty Thirteen please go to https://codex.wordpress.
 
 == Copyright ==
 
-Twenty Thirteen WordPress Theme, Copyright 2013-2024 WordPress.org, Automattic Inc., and contributors.
+Twenty Thirteen WordPress Theme, Copyright 2013-2025 WordPress.org, Automattic Inc., and contributors.
 Twenty Thirteen is Distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentytwelve/readme.txt b/src/wp-content/themes/twentytwelve/readme.txt
index 3e716ee1b4ab7..f746e9add5048 100644
--- a/src/wp-content/themes/twentytwelve/readme.txt
+++ b/src/wp-content/themes/twentytwelve/readme.txt
@@ -23,7 +23,7 @@ For more information about Twenty Twelve please go to https://codex.wordpress.or
 
 == Copyright ==
 
-Twenty Twelve WordPress Theme, Copyright 2012-2024 WordPress.org, Automattic Inc., and contributors.
+Twenty Twelve WordPress Theme, Copyright 2012-2025 WordPress.org, Automattic Inc., and contributors.
 Twenty Twelve is Distributed under the terms of the GNU GPL
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentytwenty/readme.txt b/src/wp-content/themes/twentytwenty/readme.txt
index 293baaef7c382..cd5d4b01d62c3 100644
--- a/src/wp-content/themes/twentytwenty/readme.txt
+++ b/src/wp-content/themes/twentytwenty/readme.txt
@@ -121,7 +121,7 @@ Initial release
 
 == Copyright ==
 
-Twenty Twenty WordPress Theme, Copyright 2019-2024 WordPress.org and contributors.
+Twenty Twenty WordPress Theme, Copyright 2019-2025 WordPress.org and contributors.
 Twenty Twenty is distributed under the terms of the GNU GPL.
 
 This program is free software: you can redistribute it and/or modify
@@ -170,7 +170,7 @@ License URI: http://www.gnu.org/licenses/gpl-2.0.html
 Source: WordPress Social Link Block (See wp-includes\blocks\social-link.php)
 
 Code from Twenty Nineteen
-Copyright (c) 2018-2024 WordPress.org
+Copyright (c) 2018-2025 WordPress.org
 License: GPLv2
 Source: https://wordpress.org/themes/twentynineteen/
 Included as part of the following classes and functions:
@@ -180,11 +180,11 @@ Included as part of the following classes and functions:
 - twentytwenty_nav_menu_social_icons()
 
 Code from Twenty Seventeen
-Copyright (c) 2016-2024 WordPress.org
+Copyright (c) 2016-2025 WordPress.org
 License: GPLv2
 Source: https://wordpress.org/themes/twentyseventeen/
 Included as part of the following classes and functions:
 - twentytwenty_unique_id()
 
 Underscores
-https://underscores.me/, (C) 2012-2024 Automattic, Inc., [GPLv2 or later](https://www.gnu.org/licenses/gpl-2.0.html)
+https://underscores.me/, (C) 2012-2025 Automattic, Inc., [GPLv2 or later](https://www.gnu.org/licenses/gpl-2.0.html)
diff --git a/src/wp-content/themes/twentytwentyfive/readme.txt b/src/wp-content/themes/twentytwentyfive/readme.txt
index c04796c2e7343..b4dc89e9c9fe6 100644
--- a/src/wp-content/themes/twentytwentyfive/readme.txt
+++ b/src/wp-content/themes/twentytwentyfive/readme.txt
@@ -17,7 +17,7 @@ Twenty Twenty-Five emphasizes simplicity and adaptability. It offers flexible de
 
 == Copyright ==
 
-Twenty Twenty-Five WordPress Theme, (C) 2024 WordPress.org and contributors.
+Twenty Twenty-Five WordPress Theme, (C) 2024-2025 WordPress.org and contributors.
 Twenty Twenty-Five is distributed under the terms of the GNU GPL.
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentytwentyfour/readme.txt b/src/wp-content/themes/twentytwentyfour/readme.txt
index 8008a10b2fd9b..299a63d4c997c 100644
--- a/src/wp-content/themes/twentytwentyfour/readme.txt
+++ b/src/wp-content/themes/twentytwentyfour/readme.txt
@@ -35,7 +35,7 @@ https://wordpress.org/documentation/article/twenty-twenty-four-changelog/#Versio
 
 == Copyright ==
 
-Twenty Twenty-Four WordPress Theme, (C) 2023-2024 WordPress.org and contributors.
+Twenty Twenty-Four WordPress Theme, (C) 2023-2025 WordPress.org and contributors.
 Twenty Twenty-Four is distributed under the terms of the GNU GPL.
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentytwentyone/readme.txt b/src/wp-content/themes/twentytwentyone/readme.txt
index e0c9e6949c2d5..b955225ca6a83 100644
--- a/src/wp-content/themes/twentytwentyone/readme.txt
+++ b/src/wp-content/themes/twentytwentyone/readme.txt
@@ -107,7 +107,7 @@ https://wordpress.org/documentation/article/twenty-twenty-one-changelog/#Version
 
 == Copyright ==
 
-Twenty Twenty-One WordPress Theme, 2020-2024 WordPress.org and contributors.
+Twenty Twenty-One WordPress Theme, 2020-2025 WordPress.org and contributors.
 Twenty Twenty-One is distributed under the terms of the GNU GPL.
 
 This program is free software: you can redistribute it and/or modify
@@ -125,19 +125,19 @@ Twenty Twenty-One is derived from Seedlet, (C) 2020 Automattic, Inc.
 
 Twenty Twenty-One is also based on:
 
-Twenty Nineteen. 2018-2024 WordPress.org
+Twenty Nineteen. 2018-2025 WordPress.org
 Twenty Nineteen is distributed under the terms of the GNU GPL v2 or later.
 
-Twenty Seventeen. Copyright (C) 2016-2024 WordPress.org
+Twenty Seventeen. Copyright (C) 2016-2025 WordPress.org
 Twenty Seventeen is distributed under the terms of the GNU GPL v2 or later.
 
-Twenty Sixteen. Copyright (C) 2015-2024 WordPress.org
+Twenty Sixteen. Copyright (C) 2015-2025 WordPress.org
 Twenty Sixteen is distributed under the terms of the GNU GPL v2 or later.
 
-Twenty Twenty. Copyright (C) 2020-2024 WordPress.org
+Twenty Twenty. Copyright (C) 2020-2025 WordPress.org
 Twenty Twenty is distributed under the terms of the GNU GPL v2 or later.
 
-Underscores https://underscores.me/, Copyright (C) 2012-2024 Automattic, Inc.
+Underscores https://underscores.me/, Copyright (C) 2012-2025 Automattic, Inc.
 Underscores is distributed under the terms of the GNU GPL v2 or later.
 
 Normalizing styles have been helped along thanks to the fine work of
diff --git a/src/wp-content/themes/twentytwentythree/readme.txt b/src/wp-content/themes/twentytwentythree/readme.txt
index 237758249f85d..9e4653b7f4ec4 100644
--- a/src/wp-content/themes/twentytwentythree/readme.txt
+++ b/src/wp-content/themes/twentytwentythree/readme.txt
@@ -52,7 +52,7 @@ https://wordpress.org/documentation/article/twenty-twenty-three-changelog/#Versi
 
 == Copyright ==
 
-Twenty Twenty-Three WordPress Theme, (C) 2022-2024 WordPress.org and contributors.
+Twenty Twenty-Three WordPress Theme, (C) 2022-2025 WordPress.org and contributors.
 Twenty Twenty-Three is distributed under the terms of the GNU GPL.
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-content/themes/twentytwentytwo/readme.txt b/src/wp-content/themes/twentytwentytwo/readme.txt
index d2635dbfe0207..ace8251b15899 100644
--- a/src/wp-content/themes/twentytwentytwo/readme.txt
+++ b/src/wp-content/themes/twentytwentytwo/readme.txt
@@ -91,7 +91,7 @@ https://wordpress.org/documentation/article/twenty-twenty-two-changelog/#Version
 
 == Copyright ==
 
-Twenty Twenty-Two WordPress Theme, 2021-2024 WordPress.org and contributors.
+Twenty Twenty-Two WordPress Theme, 2021-2025 WordPress.org and contributors.
 Twenty Twenty-Two is distributed under the terms of the GNU GPL.
 
 This program is free software: you can redistribute it and/or modify
diff --git a/src/wp-includes/ms-functions.php b/src/wp-includes/ms-functions.php
index 263d7716af6eb..97d2f9102c30c 100644
--- a/src/wp-includes/ms-functions.php
+++ b/src/wp-includes/ms-functions.php
@@ -481,10 +481,12 @@ function wpmu_validate_user_signup( $user_name, $user_email ) {
 	}
 
 	$illegal_names = get_site_option( 'illegal_names' );
+
 	if ( ! is_array( $illegal_names ) ) {
 		$illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' );
 		add_site_option( 'illegal_names', $illegal_names );
 	}
+
 	if ( in_array( $user_name, $illegal_names, true ) ) {
 		$errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) );
 	}
@@ -516,10 +518,12 @@ function wpmu_validate_user_signup( $user_name, $user_email ) {
 	}
 
 	$limited_email_domains = get_site_option( 'limited_email_domains' );
+
 	if ( is_array( $limited_email_domains ) && ! empty( $limited_email_domains ) ) {
 		$limited_email_domains = array_map( 'strtolower', $limited_email_domains );
-		$emaildomain           = strtolower( substr( $user_email, 1 + strpos( $user_email, '@' ) ) );
-		if ( ! in_array( $emaildomain, $limited_email_domains, true ) ) {
+		$email_domain          = strtolower( substr( $user_email, 1 + strpos( $user_email, '@' ) ) );
+
+		if ( ! in_array( $email_domain, $limited_email_domains, true ) ) {
 			$errors->add( 'user_email', __( 'Sorry, that email address is not allowed!' ) );
 		}
 	}
@@ -637,7 +641,8 @@ function wpmu_validate_blog_signup( $blogname, $blog_title, $user = '' ) {
 
 	$errors        = new WP_Error();
 	$illegal_names = get_site_option( 'illegal_names' );
-	if ( empty( $illegal_names ) ) {
+
+	if ( ! is_array( $illegal_names ) ) {
 		$illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' );
 		add_site_option( 'illegal_names', $illegal_names );
 	}
@@ -721,7 +726,7 @@ function wpmu_validate_blog_signup( $blogname, $blog_title, $user = '' ) {
 	 * unless it's the user's own username.
 	 */
 	if ( username_exists( $blogname ) ) {
-		if ( ! is_object( $user ) || ( is_object( $user ) && ( $user->user_login !== $blogname ) ) ) {
+		if ( ! is_object( $user ) || ( is_object( $user ) && $user->user_login !== $blogname ) ) {
 			$errors->add( 'blogname', __( 'Sorry, that site is reserved!' ) );
 		}
 	}
@@ -1626,8 +1631,8 @@ function wpmu_welcome_notification( $blog_id, $user_id, $password, $title, $meta
 
 	$switched_locale = switch_to_user_locale( $user_id );
 
-	$welcome_email = (string) get_site_option( 'welcome_email' );
-	if ( '' === $welcome_email ) {
+	$welcome_email = get_site_option( 'welcome_email' );
+
 		/* translators: Do not translate USERNAME, SITE_NAME, BLOG_URL, PASSWORD: those are placeholders. */
 		$welcome_email = __(
 			'Howdy USERNAME,