diff -ur mantisbt-2.9.0/core/access_api.php mantis-2.9.0-AT/core/access_api.php
--- mantisbt-2.9.0/core/access_api.php	2017-12-04 06:57:48.000000000 +0500
+++ mantis-2.9.0-AT/core/access_api.php	2017-12-20 15:40:36.000000000 +0500
@@ -536,6 +536,18 @@
 	# If the bug is private and the user is not the reporter, then
 	# they must also have higher access than private_bug_threshold
 	if( !$t_bug_is_user_reporter && bug_get_field( $p_bug_id, 'view_state' ) == VS_PRIVATE ) {
+
+		// ====== check if user monitores ===== 
+		$t_bug_monitor_table = db_get_table('mantis_bug_monitor_table');
+		$query = "SELECT 1 FROM $t_bug_monitor_table WHERE bug_id=" . db_param() . " AND user_id = " . db_param();
+
+		$result = db_query_bound($query, Array($p_bug_id, $p_user_id));
+		if (db_num_rows($result)) {
+		//treat as if bug was public
+		return access_compare_level($t_access_level, $p_access_level);
+		}
+		//====== end ======
+
 		$t_private_bug_threshold = config_get( 'private_bug_threshold', null, $p_user_id, $t_project_id );
 		return access_compare_level( $t_access_level, $t_private_bug_threshold )
 			&& access_compare_level( $t_access_level, $p_access_level );

diff -ur mantisbt-2.9.0/core/filter_api.php mantis-2.9.0-AT/core/filter_api.php
--- mantisbt-2.9.0/core/filter_api.php	2017-12-04 06:57:48.000000000 +0500
+++ mantis-2.9.0-AT/core/filter_api.php	2017-12-20 15:41:26.000000000 +0500
@@ -1531,7 +1531,14 @@
 		}
 
 		$t_count_public_only_project_ids = count( $t_public_only_project_ids );
-		$t_public_view_state_check = '( ( {bug}.view_state = ' . VS_PUBLIC . ' ) OR ( {bug}.reporter_id = ' . $t_user_id . ') )';
+// ====== monitored issue view ===== 
+		$t_public_view_state_check = '( 
+                       ( {bug}.view_state = ' . VS_PUBLIC . ' ) 
+                        OR ( {bug}.reporter_id = ' . $t_user_id . ') 
+                        OR (SELECT true FROM {bug_monitor} 
+                                WHERE {bug_monitor}.user_id = ' . $t_user_id . ' 
+                                AND {bug_monitor}.bug_id = {bug}.id LIMIT 1) 
+                )';
+// ======= end ===========
 		if( $t_count_public_only_project_ids == 1 ) {
 			$t_public_only_query = '( ( {bug}.project_id = ' . $t_public_only_project_ids[0] . ' ) AND ' . $t_public_view_state_check . ')';
 		} else if( $t_count_public_only_project_ids > 1 ) {