diff --git a/doc/releasenotes.md b/doc/releasenotes.md
index c270fac14b1c64d8a1684d37dc5fc6287e459d6a..0bbf09ef7808f63bdf18b0103c3f8351b56dba5c 100644
--- a/doc/releasenotes.md
+++ b/doc/releasenotes.md
@@ -46,10 +46,14 @@ Additionally, this change includes minor improvements such as correctly setting
 - 2 New tests related with use of same apiName across different AEFs.
 - Duplicate test name capif_api_provider_management-10 changed.
 
+#### **Security Issues**
+- **Critical Authorization Bypass** vulnerability solved.
+
 ### **Documentation**
 
 - 2 New tests added to [OCF Publish API test plan documentation], related with apiName.
 - Changed name of capif_api_provider_management-10 to Update Registered Api Provider Without SuppFeat field
+- Updated expected **ProblemDetails** `detail` and `cause` error messages in test plan documentation for Discover, Events, Invoker Management, Provider Management, and Publish services to align responses with current certificate and ID validation behavior.
 
 ## **Release 4.0.0**
 
diff --git a/doc/testing/testplan/api_discover_service/README.md b/doc/testing/testplan/api_discover_service/README.md
index 983756985056781638d66a5383e17274fddc8639..caa6c7423e9da48302e0d2efd3cb433a19660cf9 100644
--- a/doc/testing/testplan/api_discover_service/README.md
+++ b/doc/testing/testplan/api_discover_service/README.md
@@ -157,8 +157,8 @@ At this documentation you will have all information and related files and exampl
      2. Error Response Body must accomplish with **ProblemDetails** data structure with:
         * status 404
         * title with message "Not Found"
-        * detail with message "API Invoker does not exist".
-        * cause with message "API Invoker id not found".
+        * detail with message "Please provide an existing Network App ID".
+        * cause with message "Certificate not found for invoker".
 
 
 ## Test Case 4: Discover Published service APIs by registered API Invoker with 1 result filtered
diff --git a/doc/testing/testplan/api_events_service/README.md b/doc/testing/testplan/api_events_service/README.md
index 7db084aa7626534c413a3fe0c21a873ec11de851..a918a25de0ec7f9bf64acc3c0385b9259eba0884 100644
--- a/doc/testing/testplan/api_events_service/README.md
+++ b/doc/testing/testplan/api_events_service/README.md
@@ -86,8 +86,8 @@ At this documentation you will have all information and related files and exampl
      2. Error Response Body must accomplish with **ProblemDetails** data structure with:
         * status 404
         * title with message "Not Found"
-        * detail with message "Invoker or APF or AEF or AMF Not found".
-        * cause with message "Subscriber Not Found".
+        * detail with message "Please provide an existing Subscriber ID".
+        * cause with message "Certificate not found for Invoker or APF or AEF or AMF".
 
   3. Event Subscriptions are not stored in CAPIF Database
 
@@ -197,8 +197,8 @@ At this documentation you will have all information and related files and exampl
 
      * status 404
      * title with message "Not Found"
-     * detail with message "Invoker or APF or AEF or AMF Not found".
-     * cause with message "Subscriber Not Found".
+     * detail with message "Please provide an existing Subscriber ID".
+     * cause with message "Certificate not found for Invoker or APF or AEF or AMF".
 
 ---
 ## Test Case 5: Deletes an individual CAPIF Event Subscription with invalid SubscriptionId
diff --git a/doc/testing/testplan/api_invoker_management/README.md b/doc/testing/testplan/api_invoker_management/README.md
index d659a8a1b43b0e6a06fde5b878a35bf811e720cd..3889a42eae73de1afc07e60a1f5d36135a86b280 100644
--- a/doc/testing/testplan/api_invoker_management/README.md
+++ b/doc/testing/testplan/api_invoker_management/README.md
@@ -173,7 +173,7 @@ At this documentation you will have all information and related files and exampl
         * status 404
         * title with message "Not Found"
         * detail with message "Please provide an existing Network App ID".
-        * cause with message "Not exist Network App ID".
+        * cause with message "Network App ID does not exist".
 
 
 ## Test Case 5: Offboard Network App
@@ -243,7 +243,7 @@ At this documentation you will have all information and related files and exampl
         * status 404
         * title with message "Not Found"
         * detail with message "Please provide an existing Network App ID".
-        * cause with message "Not exist Network App ID".
+        * cause with message "Network App ID does not exist".
 
 ## Test Case 7: Update Onboarded Network App Certificate
 
diff --git a/doc/testing/testplan/api_provider_management/README.md b/doc/testing/testplan/api_provider_management/README.md
index 2ec507f8d4fe6c493c6db51829a8f8cd18014a50..2a29aba470f83e1105d3a91b55075f908487a054 100644
--- a/doc/testing/testplan/api_provider_management/README.md
+++ b/doc/testing/testplan/api_provider_management/README.md
@@ -198,8 +198,8 @@ At this documentation you will have all information and related files and exampl
      2. body returned must accomplish **ProblemDetails** data structure, with:
         * status 404
         * title with message "Not Found"
-        * detail with message "Not Exist Provider Enrolment Details".
-        * cause with message "Not found registrations to Send **THIS** api provider details".
+        * detail with message "Please provide an existing API Provider ID".
+        * cause with message "API Provider ID does not exist".
 
 
 ## Test Case 5: Partially Update Registered Api Provider  
@@ -300,8 +300,8 @@ At this documentation you will have all information and related files and exampl
 
         * status 404
         * title with message "Not Found"
-        * detail with message "Not Exist Provider Enrolment Details".
-        * cause with message "Not found registrations to Send **THIS** api provider details".
+        * detail with message "Please provide an existing API Provider ID".
+        * cause with message "API Provider ID does not exist".
 
 
 ## Test Case 7: Delete Registered Api Provider   
@@ -396,8 +396,8 @@ At this documentation you will have all information and related files and exampl
      2. body returned must accomplish **ProblemDetails** data structure, with:
         * status 404
         * title with message "Not Found"
-        * detail with message "Not Exist Provider Enrolment Details".
-        * cause with message "Not found registrations to Send **THIS** api provider details".
+        * detail with message "Please provide an existing API Provider ID".
+        * cause with message "API Provider ID does not exist".
 
 
 ## Test Case 9: Onboard provider without supported_features
diff --git a/doc/testing/testplan/api_publish_service/README.md b/doc/testing/testplan/api_publish_service/README.md
index 61beb1751965022dc4c475f40f0e72dff3fd240f..0eb17eb569222894c0abe4982989ee51cdaa9967 100644
--- a/doc/testing/testplan/api_publish_service/README.md
+++ b/doc/testing/testplan/api_publish_service/README.md
@@ -77,8 +77,8 @@ At this documentation you will have all information and related files and exampl
      2. Error Response Body must accomplish with **ProblemDetails** data structure with:
         * status **401**
         * title with message "Unauthorized"
-        * detail with message "Publisher not existing".
-        * cause with message "Publisher id not found".
+        * detail with message "Please provide an existing APF ID".
+        * cause with message "Certificate not found for APF".
 
   2. Service API is NOT stored in CAPIF Database