diff --git a/src/wp-admin/includes/class-wp-site-health.php b/src/wp-admin/includes/class-wp-site-health.php
index de0d7cd8da332..51562a02fe112 100644
--- a/src/wp-admin/includes/class-wp-site-health.php
+++ b/src/wp-admin/includes/class-wp-site-health.php
@@ -1905,7 +1905,7 @@ public function get_test_insecure_registration() {
 		$default_role       = get_option( 'default_role' );
 
 		$result = array(
-			'label'       => __( 'Open Registration with privileged default role' ),
+			'label'       => __( 'New users are not given a privileged role' ),
 			'status'      => 'good',
 			'badge'       => array(
 				'label' => __( 'Security' ),
@@ -1917,7 +1917,8 @@ public function get_test_insecure_registration() {
 		);
 
 		if ( $users_can_register && in_array( $default_role, array( 'editor', 'administrator' ), true ) ) {
-			$result['description'] = __( 'Registration is open to anyone, and the default role is set to a privileged role.' );
+			$result['label']       = __( 'Open registration with a privileged default role' );
+			$result['description'] = '<p>' . __( 'Registration is open to anyone, and the default role is set to a privileged role.' ) . '</p>';
 			$result['status']      = 'critical';
 			$result['actions']     = sprintf(
 				'<p><a href="%s">%s</a></p>',
diff --git a/tests/phpunit/tests/admin/wpSiteHealthGetTestInsecureRegistration.php b/tests/phpunit/tests/admin/wpSiteHealthGetTestInsecureRegistration.php
new file mode 100644
index 0000000000000..402dff0a4161f
--- /dev/null
+++ b/tests/phpunit/tests/admin/wpSiteHealthGetTestInsecureRegistration.php
@@ -0,0 +1,109 @@
+<?php
+
+/**
+ * Tests for WP_Site_Health::get_test_insecure_registration().
+ *
+ * @group admin
+ * @group site-health
+ *
+ * @covers WP_Site_Health::get_test_insecure_registration
+ */
+class Tests_Admin_wpSiteHealthGetTestInsecureRegistration extends WP_UnitTestCase {
+
+	/**
+	 * Loads the Site Health class.
+	 */
+	public static function set_up_before_class() {
+		parent::set_up_before_class();
+
+		require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
+	}
+
+	/**
+	 * Tests the status for each registration setting and default role.
+	 *
+	 * @ticket 66359
+	 *
+	 * @dataProvider data_registration_settings
+	 *
+	 * @param int    $users_can_register Whether anyone can register.
+	 * @param string $default_role       The default role for new users.
+	 * @param string $expected_status    The expected test status.
+	 */
+	public function test_status_depends_on_registration_and_default_role( $users_can_register, $default_role, $expected_status ) {
+		$this->set_registration( $users_can_register );
+		update_option( 'default_role', $default_role );
+
+		$result = ( new WP_Site_Health() )->get_test_insecure_registration();
+
+		$this->assertSame( $expected_status, $result['status'] );
+		$this->assertSame( 'insecure_registration', $result['test'] );
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @return array<string, array{0: int, 1: string, 2: string}>
+	 */
+	public static function data_registration_settings() {
+		return array(
+			'registration closed, administrator' => array( 0, 'administrator', 'good' ),
+			'registration closed, editor'        => array( 0, 'editor', 'good' ),
+			'registration open, subscriber'      => array( 1, 'subscriber', 'good' ),
+			'registration open, contributor'     => array( 1, 'contributor', 'good' ),
+			'registration open, author'          => array( 1, 'author', 'good' ),
+			'registration open, editor'          => array( 1, 'editor', 'critical' ),
+			'registration open, administrator'   => array( 1, 'administrator', 'critical' ),
+		);
+	}
+
+	/**
+	 * Tests that a passing result does not use the label describing the problem.
+	 *
+	 * @ticket 66359
+	 */
+	public function test_passing_result_has_a_label_describing_the_safe_state() {
+		$this->set_registration( 1 );
+		update_option( 'default_role', 'subscriber' );
+
+		$result = ( new WP_Site_Health() )->get_test_insecure_registration();
+
+		$this->assertSame( 'good', $result['status'] );
+		$this->assertSame( 'New users are not given a privileged role', $result['label'] );
+		$this->assertSame( '', $result['actions'] );
+	}
+
+	/**
+	 * Tests the label, description markup and action of a critical result.
+	 *
+	 * @ticket 66359
+	 */
+	public function test_critical_result_describes_the_problem() {
+		$this->set_registration( 1 );
+		update_option( 'default_role', 'administrator' );
+
+		$result = ( new WP_Site_Health() )->get_test_insecure_registration();
+
+		$this->assertSame( 'critical', $result['status'] );
+		$this->assertSame( 'Open registration with a privileged default role', $result['label'] );
+		$this->assertStringStartsWith( '<p>', $result['description'], 'The description should be wrapped in a paragraph like other Site Health results.' );
+		$this->assertStringEndsWith( '</p>', $result['description'] );
+		$this->assertStringContainsString( admin_url( 'options-general.php' ), $result['actions'] );
+	}
+
+	/**
+	 * Opens or closes registration.
+	 *
+	 * On multisite, the `users_can_register` option is filtered to follow the
+	 * network's `registration` setting, see users_can_register_signup_filter().
+	 *
+	 * @param int $users_can_register Whether anyone can register.
+	 */
+	private function set_registration( $users_can_register ) {
+		if ( is_multisite() ) {
+			update_site_option( 'registration', $users_can_register ? 'user' : 'none' );
+		} else {
+			update_option( 'users_can_register', $users_can_register );
+		}
+	}
+}