diff --git a/docs/changelog/134636.yaml b/docs/changelog/134636.yaml
new file mode 100644
index 0000000000000..fac059b120b4f
--- /dev/null
+++ b/docs/changelog/134636.yaml
@@ -0,0 +1,6 @@
+pr: 134636
+summary: "[Island Browser] Add `manage`, `create_index`, `read`, `index`, `write`, `delete`, permission for third party agent indices `kibana_system`"
+area: Authorization
+type: enhancement
+issues:
+  - 134136
diff --git a/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/store/KibanaOwnedReservedRoleDescriptors.java b/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/store/KibanaOwnedReservedRoleDescriptors.java
index 5bf438ce540f4..7c60ae20f593b 100644
--- a/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/store/KibanaOwnedReservedRoleDescriptors.java
+++ b/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/store/KibanaOwnedReservedRoleDescriptors.java
@@ -549,11 +549,17 @@ static RoleDescriptor kibanaSystem(String name) {
                         TransportDeleteIndexAction.TYPE.name()
                     )
                     .build(),
-                // For ExtraHop, QualysGAV, and SentinelOne Application Dataset specific actions. Kibana reads, writes and manages this
-                // index
+                // For ExtraHop, QualysGAV, SentinelOne Application Dataset and Island Browser specific actions.
+                // Kibana reads, writes and manages this index
                 // for configured ILM policies.
                 RoleDescriptor.IndicesPrivileges.builder()
-                    .indices("logs-extrahop.investigation-*", "logs-qualys_gav.asset-*", "logs-sentinel_one.application-*")
+                    .indices(
+                        "logs-extrahop.investigation-*",
+                        "logs-qualys_gav.asset-*",
+                        "logs-sentinel_one.application-*",
+                        "logs-island_browser.user-*",
+                        "logs-island_browser.device-*"
+                    )
                     .privileges(
                         "manage",
                         "create_index",
diff --git a/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java b/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java
index 06bb32df2ae6d..8eae87cebb32d 100644
--- a/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java
+++ b/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java
@@ -1976,12 +1976,15 @@ public void testKibanaSystemRole() {
             assertThat(kibanaRole.indices().allowedIndicesMatcher(RolloverAction.NAME).test(indexAbstraction), is(true));
         });
 
-        // Tests for third-party agent indices (ExtraHop, QualysGAV, SentinelOne) that `kibana_system` has full management access to
+        // Tests for third-party agent indices (ExtraHop, QualysGAV, SentinelOne, Island Browser) that `kibana_system`
+        // has full management access to
         // This includes read, write, create, delete, and all ILM-related management actions.
         Arrays.asList(
             "logs-extrahop.investigation-" + randomAlphaOfLength(randomIntBetween(1, 10)),
             "logs-qualys_gav.asset-" + randomAlphaOfLength(randomIntBetween(1, 10)),
-            "logs-sentinel_one.application-" + randomAlphaOfLength(randomIntBetween(1, 10))
+            "logs-sentinel_one.application-" + randomAlphaOfLength(randomIntBetween(1, 10)),
+            "logs-island_browser.user-" + randomAlphaOfLength(randomIntBetween(1, 10)),
+            "logs-island_browser.device-" + randomAlphaOfLength(randomIntBetween(1, 10))
         ).forEach((index_qualys_extra_hop) -> {
             final IndexAbstraction indexAbstraction = mockIndexAbstraction(index_qualys_extra_hop);