diff --git a/src/wp-admin/network/users.php b/src/wp-admin/network/users.php
index 7ddd5f40a662b..183f27bbe8d83 100644
--- a/src/wp-admin/network/users.php
+++ b/src/wp-admin/network/users.php
@@ -86,16 +86,26 @@
 											/* translators: %s: User login. */
 											__( 'Warning! User cannot be modified. The user %s is a network administrator.' ),
 											esc_html( $user->user_login )
-										)
+										),
+										403
 									);
 								}
 
 								$userfunction = 'all_spam';
-								$blogs        = get_blogs_of_user( $user_id, true );
 
-								foreach ( (array) $blogs as $details ) {
-									if ( ! is_main_site( $details->userblog_id ) ) { // Main site is not a spam!
-										update_blog_status( $details->userblog_id, 'spam', '1' );
+								/**
+								 * Filters whether to propagate the blog status when a user is marked as spam.
+								 *
+								 * @since 7.0.0
+								 *
+								 * @param bool $propagate Whether to propagate the blog status. Default false.
+								 * @param int  $user_id   User ID.
+								 */
+								if ( apply_filters( 'propagate_network_user_spam_to_blogs', false, $user_id ) ) {
+									foreach ( get_blogs_of_user( $user_id, true ) as $details ) {
+										if ( ! is_main_site( $details->userblog_id ) ) { // Main site is not a spam!
+											update_blog_status( $details->userblog_id, 'spam', '1' );
+										}
 									}
 								}
 
@@ -107,12 +117,27 @@
 
 							case 'notspam':
 								$user = get_userdata( $user_id );
+								if ( is_super_admin( $user->ID ) ) {
+									wp_die(
+										sprintf(
+											/* translators: %s: User login. */
+											__( 'Warning! User cannot be modified. The user %s is a network administrator.' ),
+											esc_html( $user->user_login )
+										),
+										403
+									);
+								}
 
 								$userfunction = 'all_notspam';
 								$blogs        = get_blogs_of_user( $user_id, true );
 
-								foreach ( (array) $blogs as $details ) {
-									update_blog_status( $details->userblog_id, 'spam', '0' );
+								/** This filter is documented in wp-admin/network/users.php */
+								if ( apply_filters( 'propagate_network_user_spam_to_blogs', false, $user_id ) ) {
+									foreach ( get_blogs_of_user( $user_id, true ) as $details ) {
+										if ( ! is_main_site( $details->userblog_id ) && get_current_network_id() === $details->site_id ) { // Main site is never a spam and part of the current network.
+											update_blog_status( $details->userblog_id, 'spam', '0' );
+										}
+									}
 								}
 
 								$user_data         = $user->to_array();
diff --git a/tests/phpunit/tests/user.php b/tests/phpunit/tests/user.php
index b11d24a5caacc..623f99b3765eb 100644
--- a/tests/phpunit/tests/user.php
+++ b/tests/phpunit/tests/user.php
@@ -883,6 +883,66 @@ public function test_wp_update_user_should_not_mark_user_as_spam_on_single_site(
 		$this->assertSame( 'no_spam', $u->get_error_code() );
 	}
 
+	/**
+	 * Helper to create a user and add them to multiple blogs.
+	 *
+	 * @param int  $num_blogs          Number of additional blogs to create and add the user to.
+	 * @param bool $include_main_site  Whether to add the user to the main site as well.
+	 * @return array Array with 'user_id' and 'blogs' (array of blog IDs).
+	 */
+	private function create_user_with_blogs( $num_blogs = 1, $include_main_site = false ) {
+		$user_id = self::factory()->user->create();
+
+		$blogs = array();
+		if ( $include_main_site ) {
+			add_user_to_blog( get_main_site_id(), $user_id, 'administrator' );
+			$blogs[] = get_main_site_id();
+		}
+
+		for ( $i = 0; $i < $num_blogs; $i++ ) {
+			$blog_id = self::factory()->blog->create(
+				array(
+					'site_id' => get_current_network_id(),
+				)
+			);
+			add_user_to_blog( $blog_id, $user_id, 'administrator' );
+			$blogs[] = $blog_id;
+		}
+
+		return array(
+			'user_id' => $user_id,
+			'blogs'   => $blogs,
+		);
+	}
+
+	/**
+	 * @ticket 61146
+	 */
+	public function test_default_do_not_propagate_network_user_spam_to_blogs_on_multisite() {
+		if ( ! is_multisite() ) {
+			$this->markTestSkipped( 'This test is for multisite only.' );
+		}
+
+		$data    = $this->create_user_with_blogs( 2 );
+		$user_id = $data['user_id'];
+		$blogs   = $data['blogs'];
+
+		// Mark user spam in user record (this alone should not change blog spam states).
+		$u = wp_update_user(
+			array(
+				'ID'   => $user_id,
+				'spam' => '1',
+			)
+		);
+		$this->assertNotWPError( $u );
+		$user = get_userdata( $user_id );
+		$this->assertSame( '1', $user->spam );
+
+		foreach ( $blogs as $blog_id ) {
+			$this->assertNotSame( '1', get_blog_status( $blog_id, 'spam' ), "Blog {$blog_id} should not be marked spam by default." );
+		}
+	}
+
 	/**
 	 * @ticket 28315
 	 */