diff --git a/src/main/java/com/cloudhandson/vpdbackoffice/mapper/PermissionMapper.java b/src/main/java/com/cloudhandson/vpdbackoffice/mapper/PermissionMapper.java
index c5341e6..1428a88 100644
--- a/src/main/java/com/cloudhandson/vpdbackoffice/mapper/PermissionMapper.java
+++ b/src/main/java/com/cloudhandson/vpdbackoffice/mapper/PermissionMapper.java
@@ -29,6 +29,10 @@ public interface PermissionMapper {
 
   Long findPermissionId(@Param("roleId") long roleId, @Param("objectId") long objectId);
 
+  Long findObjectIdByPermissionId(@Param("permissionId") long permissionId);
+
+  int countPermissionsByObjectId(@Param("objectId") long objectId);
+
   void insertPermission(@Param("permissionId") long permissionId,
                         @Param("roleId") long roleId,
                         @Param("objectId") long objectId,
diff --git a/src/main/java/com/cloudhandson/vpdbackoffice/mapper/ProtectedObjectMapper.java b/src/main/java/com/cloudhandson/vpdbackoffice/mapper/ProtectedObjectMapper.java
index e4b89c3..dd7821d 100644
--- a/src/main/java/com/cloudhandson/vpdbackoffice/mapper/ProtectedObjectMapper.java
+++ b/src/main/java/com/cloudhandson/vpdbackoffice/mapper/ProtectedObjectMapper.java
@@ -13,6 +13,8 @@ public interface ProtectedObjectMapper {
 
   List<ProtectedObject> findEnabled();
 
+  List<ProtectedObject> findEnabledWithPermissions();
+
   ProtectedObject findById(@Param("objectId") long objectId);
 
   ProtectedObject findByOwnerAndName(@Param("owner") String owner, @Param("objectName") String objectName);
diff --git a/src/main/java/com/cloudhandson/vpdbackoffice/service/PermissionService.java b/src/main/java/com/cloudhandson/vpdbackoffice/service/PermissionService.java
index ba70218..ba3f37d 100644
--- a/src/main/java/com/cloudhandson/vpdbackoffice/service/PermissionService.java
+++ b/src/main/java/com/cloudhandson/vpdbackoffice/service/PermissionService.java
@@ -110,12 +110,16 @@ public class PermissionService {
 
   @Transactional
   public void deletePermission(long permissionId) {
+    Long objectId = permissionMapper.findObjectIdByPermissionId(permissionId);
     permissionMapper.deleteRules(permissionId);
     permissionMapper.deleteVisibleColumns(permissionId);
     int deleted = permissionMapper.deletePermission(permissionId);
     if (deleted == 0) {
       throw new AppException("삭제할 권한을 찾을 수 없습니다.");
     }
+    if (objectId != null && permissionMapper.countPermissionsByObjectId(objectId) == 0) {
+      protectedObjectService.disableObject(objectId);
+    }
     auditService.record(new AuditEvent("PERMISSION_DELETED", null, null, "SUCCESS", null, null,
         "permissionId=" + permissionId));
   }
diff --git a/src/main/java/com/cloudhandson/vpdbackoffice/service/ProtectedObjectService.java b/src/main/java/com/cloudhandson/vpdbackoffice/service/ProtectedObjectService.java
index aa82f47..553b934 100644
--- a/src/main/java/com/cloudhandson/vpdbackoffice/service/ProtectedObjectService.java
+++ b/src/main/java/com/cloudhandson/vpdbackoffice/service/ProtectedObjectService.java
@@ -35,6 +35,10 @@ public class ProtectedObjectService {
     return mapper.findEnabled();
   }
 
+  public List<ProtectedObject> findEnabledWithPermissions() {
+    return mapper.findEnabledWithPermissions();
+  }
+
   public List<DatabaseObjectOption> findDatabaseObjects() {
     CacheEntry<List<DatabaseObjectOption>> cached = databaseObjectsCache;
     if (cached != null && !cached.expired()) {
@@ -83,6 +87,7 @@ public class ProtectedObjectService {
     for (String column : splitCsv(normalized.columns())) {
       mapper.insertColumn(mapper.nextColumnId(), objectId, column, sensitive.contains(column) ? "Y" : "N");
     }
+    databaseObjectsCache = null;
     protectedColumnsCache.remove(objectId);
     auditService.record(new AuditEvent("PROTECTED_OBJECT_CREATED", null, objectId, "SUCCESS", null, null,
         normalized.objectName()));
@@ -96,6 +101,8 @@ public class ProtectedObjectService {
     if (existing != null) {
       if (!existing.enabled()) {
         mapper.enableObject(existing.objectId());
+        databaseObjectsCache = null;
+        protectedColumnsCache.remove(existing.objectId());
         auditService.record(new AuditEvent("PROTECTED_OBJECT_RE_ENABLED", null, existing.objectId(), "SUCCESS", null,
             null, existing.displayName()));
         return mapper.findById(existing.objectId());
@@ -119,6 +126,7 @@ public class ProtectedObjectService {
     for (String column : columns) {
       mapper.insertColumn(mapper.nextColumnId(), objectId, column, "N");
     }
+    databaseObjectsCache = null;
     protectedColumnsCache.remove(objectId);
     auditService.record(new AuditEvent("PROTECTED_OBJECT_AUTO_CREATED", null, objectId, "SUCCESS", null, null,
         command.objectName()));
@@ -162,6 +170,8 @@ public class ProtectedObjectService {
     if (updated == 0) {
       throw new AppException("보호 객체를 찾을 수 없습니다.");
     }
+    databaseObjectsCache = null;
+    protectedColumnsCache.remove(objectId);
     auditService.record(new AuditEvent("PROTECTED_OBJECT_DISABLED", null, objectId, "SUCCESS", null, null, null));
   }
 
diff --git a/src/main/java/com/cloudhandson/vpdbackoffice/web/PermissionController.java b/src/main/java/com/cloudhandson/vpdbackoffice/web/PermissionController.java
index 798133f..42f8ba6 100644
--- a/src/main/java/com/cloudhandson/vpdbackoffice/web/PermissionController.java
+++ b/src/main/java/com/cloudhandson/vpdbackoffice/web/PermissionController.java
@@ -63,7 +63,7 @@ public class PermissionController {
   @GetMapping("/permissions")
   public String permissions(Model model) {
     long started = System.nanoTime();
-    var objects = protectedObjectService.findEnabled();
+    var objects = protectedObjectService.findEnabledWithPermissions();
     long objectsAt = System.nanoTime();
     var roles = permissionService.findRoles();
     long rolesAt = System.nanoTime();
diff --git a/src/main/resources/mapper/PermissionMapper.xml b/src/main/resources/mapper/PermissionMapper.xml
index 5b2e133..955219b 100644
--- a/src/main/resources/mapper/PermissionMapper.xml
+++ b/src/main/resources/mapper/PermissionMapper.xml
@@ -84,6 +84,20 @@
       AND o.object_id = #{objectId}
   </select>
 
+  <select id="findObjectIdByPermissionId" resultType="long">
+    SELECT o.object_id
+    FROM cb_permission p
+    JOIN cb_protected_object o ON o.object_name = p.target_name
+    WHERE p.perm_id = #{permissionId}
+  </select>
+
+  <select id="countPermissionsByObjectId" resultType="int">
+    SELECT COUNT(*)
+    FROM cb_permission p
+    JOIN cb_protected_object o ON o.object_name = p.target_name
+    WHERE o.object_id = #{objectId}
+  </select>
+
   <select id="findPermissionSet" resultType="com.cloudhandson.vpdbackoffice.domain.permission.PermissionSet">
     SELECT p.perm_id AS permission_id,
            p.role_id,
diff --git a/src/main/resources/mapper/ProtectedObjectMapper.xml b/src/main/resources/mapper/ProtectedObjectMapper.xml
index 0ff07f3..1a95e26 100644
--- a/src/main/resources/mapper/ProtectedObjectMapper.xml
+++ b/src/main/resources/mapper/ProtectedObjectMapper.xml
@@ -9,6 +9,14 @@
     ORDER BY owner, object_name
   </select>
 
+  <select id="findEnabledWithPermissions" resultType="com.cloudhandson.vpdbackoffice.domain.protectedobject.ProtectedObject">
+    SELECT DISTINCT po.object_id, po.owner, po.object_name, po.ords_path, po.enabled_yn
+    FROM cb_protected_object po
+    JOIN cb_permission p ON p.target_name = po.object_name
+    WHERE po.enabled_yn = 'Y'
+    ORDER BY po.owner, po.object_name
+  </select>
+
   <select id="findById" resultType="com.cloudhandson.vpdbackoffice.domain.protectedobject.ProtectedObject">
     SELECT object_id, owner, object_name, ords_path, enabled_yn
     FROM cb_protected_object
@@ -31,6 +39,7 @@
       AND NOT EXISTS (
         SELECT 1
         FROM cb_protected_object po
+        JOIN cb_permission p ON p.target_name = po.object_name
         WHERE po.owner = all_objects.owner
           AND po.object_name = all_objects.object_name
           AND po.enabled_yn = 'Y'
diff --git a/src/test/java/com/cloudhandson/vpdbackoffice/service/PermissionServiceTest.java b/src/test/java/com/cloudhandson/vpdbackoffice/service/PermissionServiceTest.java
index 7ec9961..6012f29 100644
--- a/src/test/java/com/cloudhandson/vpdbackoffice/service/PermissionServiceTest.java
+++ b/src/test/java/com/cloudhandson/vpdbackoffice/service/PermissionServiceTest.java
@@ -1,5 +1,6 @@
 package com.cloudhandson.vpdbackoffice.service;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import com.cloudhandson.vpdbackoffice.domain.audit.AuditEvent;
@@ -74,6 +75,24 @@ class PermissionServiceTest {
         .hasMessageContaining("허용되지 않은");
   }
 
+  @Test
+  void disablesProtectedObjectWhenLastPermissionIsDeleted() {
+    var mapper = new FakePermissionMapper();
+    boolean[] disabled = {false};
+    AuditService auditService = new AuditService(new NoopAuditMapper());
+    ProtectedObjectService objectService = new ProtectedObjectService(null, auditService) {
+      @Override
+      public void disableObject(long objectId) {
+        disabled[0] = objectId == 1L;
+      }
+    };
+    PermissionService service = new PermissionService(mapper, objectService, auditService);
+
+    service.deletePermission(1000L);
+
+    assertThat(disabled[0]).isTrue();
+  }
+
   private static class NoopAuditMapper implements AuditMapper {
     @Override
     public void insert(AuditEvent event) {
@@ -120,6 +139,16 @@ class PermissionServiceTest {
       return null;
     }
 
+    @Override
+    public Long findObjectIdByPermissionId(long permissionId) {
+      return permissionId == 1000L ? 1L : null;
+    }
+
+    @Override
+    public int countPermissionsByObjectId(long objectId) {
+      return 0;
+    }
+
     @Override
     public void insertPermission(long permissionId, long roleId, long objectId, String action) {
     }