diff --git a/AxonIvyPortal/portal/cms/cms_de.yaml b/AxonIvyPortal/portal/cms/cms_de.yaml
index ad6e7ba2dc7..4daa133f422 100644
--- a/AxonIvyPortal/portal/cms/cms_de.yaml
+++ b/AxonIvyPortal/portal/cms/cms_de.yaml
@@ -1562,6 +1562,9 @@ Dialogs:
             expressNoItemDescription: Hier werden die Ergebnisse der abgeschlossenen Aufgaben angezeigt
             expressWorkflowName: 'Business Details des Vorgangs: #{0}'
         portal:
+          component:
+            ProcessInformation:
+              ProcessUnavailableTooltip: Dieser Prozess ist nicht verfügbar oder du hast keine Berechtigung, ihn zu starten.
           generic:
             dashboard:
               component:
diff --git a/AxonIvyPortal/portal/cms/cms_en.yaml b/AxonIvyPortal/portal/cms/cms_en.yaml
index dbda607855c..12ce6d227fb 100644
--- a/AxonIvyPortal/portal/cms/cms_en.yaml
+++ b/AxonIvyPortal/portal/cms/cms_en.yaml
@@ -1565,6 +1565,9 @@ Dialogs:
             expressNoItemDescription: The results of completed tasks are displayed here
             expressWorkflowName: 'Business Details of Case #{0}'
         portal:
+          component:
+            ProcessInformation:
+              ProcessUnavailableTooltip: This process is unavailable or you don't have the permission to start it.
           generic:
             dashboard:
               component:
diff --git a/AxonIvyPortal/portal/cms/cms_es.yaml b/AxonIvyPortal/portal/cms/cms_es.yaml
index 591235ed467..9b709b52d82 100644
--- a/AxonIvyPortal/portal/cms/cms_es.yaml
+++ b/AxonIvyPortal/portal/cms/cms_es.yaml
@@ -1566,6 +1566,9 @@ Dialogs:
             expressNoItemDescription: Aquí se mostrarán los resultados de las tareas completadas
             expressWorkflowName: 'Detalles de negocio del caso #{0}'
         portal:
+          component:
+            ProcessInformation:
+              ProcessUnavailableTooltip: Este proceso no está disponible o no tienes permiso para iniciarlo.
           generic:
             dashboard:
               component:
diff --git a/AxonIvyPortal/portal/cms/cms_fr.yaml b/AxonIvyPortal/portal/cms/cms_fr.yaml
index 422d0141e82..d83dbc4b059 100644
--- a/AxonIvyPortal/portal/cms/cms_fr.yaml
+++ b/AxonIvyPortal/portal/cms/cms_fr.yaml
@@ -1563,6 +1563,9 @@ Dialogs:
             expressNoItemDescription: Les résultats des tâches terminées sont affichés ici
             expressWorkflowName: 'Détails de cas #{0}'
         portal:
+          component:
+            ProcessInformation:
+              ProcessUnavailableTooltip: Ce processus est indisponible ou vous n'avez pas la permission de le démarrer.
           generic:
             dashboard:
               component:
diff --git a/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/bean/CompactProcessWidgetBean.java b/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/bean/CompactProcessWidgetBean.java
index 2c57fc87dc9..4e7bbd22fa0 100644
--- a/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/bean/CompactProcessWidgetBean.java
+++ b/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/bean/CompactProcessWidgetBean.java
@@ -334,6 +334,11 @@ public void startProcess(UserProcess userProcess) throws IOException {
     FacesContext.getCurrentInstance().getExternalContext().redirect(link + "embedInFrame");
   }
   
+  public boolean canStartProcess(UserProcess userProcess) {
+    return StringUtils.isNotBlank(
+        Optional.ofNullable(userProcess).map(UserProcess::getLink).orElse(""));
+  }
+
   private boolean isUserProcess(UserProcess processToAdd) {
     return userProcesses.stream().anyMatch(userProcess -> !isExternalLink(processToAdd)
         && StringUtils.equalsIgnoreCase(userProcess.getLink(), processToAdd.getLink()));
diff --git a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portal/component/ProcessInformation/ProcessInformation.xhtml b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portal/component/ProcessInformation/ProcessInformation.xhtml
index 6e9645736b0..8ef9e34009a 100644
--- a/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portal/component/ProcessInformation/ProcessInformation.xhtml
+++ b/AxonIvyPortal/portal/src_hd/ch/ivy/addon/portal/component/ProcessInformation/ProcessInformation.xhtml
@@ -28,11 +28,19 @@
     </ui:define>
 
     <ui:define name="actionButtons">
+      <div class="flex flex-row justify-content-end align-items-center">
       <p:link id="back-link" value="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/common/back')}" onclick="goBack();" href="#"/>
       <p:spacer width="20px" />
-      <p:commandButton value="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/common/start')} #{data.selectedProcess.processName}"
+      <h:panelGroup id="start-process-button-container" layout="block">
+        <p:commandButton value="#{ivy.cms.co('/ch.ivy.addon.portalkit.ui.jsf/common/start')} #{data.selectedProcess.processName}"
         id="start-process-button"
+        disabled="#{!compactProcessWidgetBean.canStartProcess(data.selectedProcess)}"
         actionListener="#{compactProcessWidgetBean.startProcess(data.selectedProcess)}" />
+      </h:panelGroup>
+      <p:tooltip for="start-process-button-container" value="#{ivy.cms.co('/Dialogs/ch/ivy/addon/portal/component/ProcessInformation/ProcessUnavailableTooltip')}"
+        rendered="#{!compactProcessWidgetBean.canStartProcess(data.selectedProcess)}" trackMouse="true" />
+      </div>
+      
         <script>
         function goBack() {
           window.history.back();
diff --git a/AxonIvyPortal/portal/webContent/resources/css/utility.css b/AxonIvyPortal/portal/webContent/resources/css/utility.css
index 3f0c9eef6ce..6d23df88607 100644
--- a/AxonIvyPortal/portal/webContent/resources/css/utility.css
+++ b/AxonIvyPortal/portal/webContent/resources/css/utility.css
@@ -402,3 +402,20 @@
 .w-min {
   width: min-content !important;
 }
+
+/* From Primeflex 3 */
+.flex {
+  display: flex !important
+}
+
+.flex-row {
+  flex-direction: row !important
+}
+
+.justify-content-end {
+  justify-content: flex-end !important
+}
+
+.align-items-center {
+  align-items: center !important
+}
\ No newline at end of file