diff --git a/check_es_system/check_es_system-1.12.0/.travis.yml b/check_es_system/check_es_system-1.12.1/.travis.yml
similarity index 74%
rename from check_es_system/check_es_system-1.12.0/.travis.yml
rename to check_es_system/check_es_system-1.12.1/.travis.yml
index b597922..9e437af 100644
--- a/check_es_system/check_es_system-1.12.0/.travis.yml
+++ b/check_es_system/check_es_system-1.12.1/.travis.yml
@@ -15,8 +15,8 @@ before_script:
 
 script: 
         - ./check_es_system.sh --help || true
-        - |
-          test/test_status.sh
-          test/test_readonly.sh
+        - test/test_status.sh
+        - test/test_readonly.sh
+        - test/test_disk.sh
 
   
diff --git a/check_es_system/check_es_system-1.12.0/LICENSE b/check_es_system/check_es_system-1.12.1/LICENSE
similarity index 100%
rename from check_es_system/check_es_system-1.12.0/LICENSE
rename to check_es_system/check_es_system-1.12.1/LICENSE
diff --git a/check_es_system/check_es_system-1.12.0/README.md b/check_es_system/check_es_system-1.12.1/README.md
similarity index 100%
rename from check_es_system/check_es_system-1.12.0/README.md
rename to check_es_system/check_es_system-1.12.1/README.md
diff --git a/check_es_system/check_es_system-1.12.0/check_es_system.sh b/check_es_system/check_es_system-1.12.1/check_es_system.sh
similarity index 97%
rename from check_es_system/check_es_system-1.12.0/check_es_system.sh
rename to check_es_system/check_es_system-1.12.1/check_es_system.sh
index 49dcef5..57d386f 100755
--- a/check_es_system/check_es_system-1.12.0/check_es_system.sh
+++ b/check_es_system/check_es_system-1.12.1/check_es_system.sh
@@ -3,7 +3,7 @@
 # Script:       check_es_system.sh                                             #
 # Author:       Claudio Kuenzler www.claudiokuenzler.com                       #
 # Purpose:      Monitor ElasticSearch Store (Disk) Usage                       #
-# Official doc: www.claudiokuenzler.com/monitoring-plugins/check_es_system.php #
+# Docs:         www.claudiokuenzler.com/monitoring-plugins/check_es_system.php #
 # License:      GPLv2                                                          #
 # GNU General Public Licence (GPL) http://www.gnu.org/                         #
 # This program is free software; you can redistribute it and/or                #
@@ -19,14 +19,14 @@
 # You should have received a copy of the GNU General Public License            #
 # along with this program; if not, see <https://www.gnu.org/licenses/>.        #
 #                                                                              #
-# Copyright 2016,2018-2021 Claudio Kuenzler                                    #
+# Copyright 2016,2018-2021,2023 Claudio Kuenzler                               #
 # Copyright 2018 Tomas Barton                                                  #
 # Copyright 2020 NotAProfessionalDeveloper                                     #
 # Copyright 2020 tatref                                                        #
 # Copyright 2020 fbomj                                                         #
 # Copyright 2021 chicco27                                                      #
 #                                                                              #
-# History:                                                                     #
+# History/Changelog:                                                           #
 # 20160429: Started programming plugin                                         #
 # 20160601: Continued programming. Working now as it should =)                 #
 # 20160906: Added memory usage check, check types option (-t)                  #
@@ -59,6 +59,7 @@
 # 20201125: Show names of read_only indexes with jq, set jq as default parser  #
 # 20210616: Fix authentication bug (#38) and non ES URL responding (#39)       #
 # 20211202: Added local node (-L), SSL settings (-K, -E), cpu check            #
+# 20230929: Bugfix in readonly check type for missing privileges               #
 ################################################################################
 #Variables and defaults
 STATE_OK=0              # define the exit code if status is OK
@@ -66,7 +67,7 @@ STATE_WARNING=1         # define the exit code if status is Warning
 STATE_CRITICAL=2        # define the exit code if status is Critical
 STATE_UNKNOWN=3         # define the exit code if status is Unknown
 export PATH=$PATH:/usr/local/bin:/usr/bin:/bin # Set path
-version=1.12.0
+version=1.12.1
 port=9200
 httpscheme=http
 unit=G
@@ -499,6 +500,10 @@ readonly) # Check Readonly status on given indexes
       elif [[ $? -eq 28 ]]; then
         echo "ES SYSTEM CRITICAL - server did not respond within ${max_time} seconds"
         exit $STATE_CRITICAL
+      elif [[ "$settings" =~ "is unauthorized" ]]; then
+        errormsg=$(echo "$settings" | json_parse -r -q -c -x error -x reason)
+        echo "ES SYSTEM CRITICAL - Access denied ($errormsg)"
+        exit $STATE_CRITICAL
       fi
       rocount=$(echo $settings | json_parse -r -q -c -a -x settings -x index -x blocks -x read_only | grep -c true)
       roadcount=$(echo $settings | json_parse -r -q -c -a -x settings -x index -x blocks -x read_only_allow_delete | grep -c true)
@@ -523,11 +528,12 @@ readonly) # Check Readonly status on given indexes
       elif [[ $settingsrc -eq 28 ]]; then
         echo "ES SYSTEM CRITICAL - server did not respond within ${max_time} seconds"
         exit $STATE_CRITICAL
-      elif [[ -n $(echo $esstatus | grep -i "unable to authenticate") ]]; then
+      elif [[ -n $(echo "$settings" | grep -i "unable to authenticate") ]]; then
         echo "ES SYSTEM CRITICAL - Unable to authenticate user $user for REST request"
         exit $STATE_CRITICAL
-      elif [[ -n $(echo $esstatus | grep -i "unauthorized") ]]; then
-        echo "ES SYSTEM CRITICAL - User $user is unauthorized"
+      elif [[ "$settings" =~ "is unauthorized" ]]; then
+        errormsg=$(echo "$settings" | json_parse -r -q -c -x error -x reason)
+        echo "ES SYSTEM CRITICAL - Access denied ($errormsg)"
         exit $STATE_CRITICAL
       fi
       rocount=$(echo $settings | json_parse -r -q -c -a -x settings -x index -x blocks -x read_only | grep -c true)
diff --git a/check_es_system/check_es_system-1.12.1/test/test_disk.sh b/check_es_system/check_es_system-1.12.1/test/test_disk.sh
new file mode 100755
index 0000000..ac4155a
--- /dev/null
+++ b/check_es_system/check_es_system-1.12.1/test/test_disk.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+echo "Test Elasticsearch status"
+./check_es_system.sh -H 127.0.0.1 -P 9200 -t disk
+output=$(./check_es_system.sh -H 127.0.0.1 -P 9200 -t disk)
+
+if [[ $? -eq 0 ]]; then
+  echo -e "\e[1m\e[32m✔ Test 3.1 OK: Disk check worked and shows green\e[0m"
+  exitcode=0
+else
+  echo -e "\e[1m\e[31m✘ Test 3.1 ERROR: Disk check has not worked\e[0m"
+  exitcode=1
+fi
+
+if ! [[ "${output}" =~ "ES SYSTEM OK - Disk usage is at 0%" ]]; then
+  exitcode=1
+fi
+
+exit $exitcode
diff --git a/check_es_system/check_es_system-1.12.0/test/test_readonly.sh b/check_es_system/check_es_system-1.12.1/test/test_readonly.sh
similarity index 100%
rename from check_es_system/check_es_system-1.12.0/test/test_readonly.sh
rename to check_es_system/check_es_system-1.12.1/test/test_readonly.sh
diff --git a/check_es_system/check_es_system-1.12.0/test/test_status.sh b/check_es_system/check_es_system-1.12.1/test/test_status.sh
similarity index 100%
rename from check_es_system/check_es_system-1.12.0/test/test_status.sh
rename to check_es_system/check_es_system-1.12.1/test/test_status.sh
diff --git a/check_es_system/control b/check_es_system/control
index 45941ca..c01e200 100644
--- a/check_es_system/control
+++ b/check_es_system/control
@@ -1,6 +1,6 @@
 Uploaders: Jan Wagner <waja@cyconet.org>
 Recommends: curl, jshon | jq
-Version: 1.12.0
+Version: 1.12.1
 Homepage: https://github.com/Napsty/check_es_system/
 Watch: https://github.com/Napsty/check_es_system/tags .*/v?(\d\S+)\.tar\.gz
 Description: Plugin script to check the status of an ElasticSearch cluster node.
diff --git a/check_es_system/src b/check_es_system/src
index 8d0891b..478cf69 120000
--- a/check_es_system/src
+++ b/check_es_system/src
@@ -1 +1 @@
-check_es_system-1.12.0/
\ No newline at end of file
+check_es_system-1.12.1/
\ No newline at end of file