diff --git a/ydb/core/client/server/msgbus_blobstorage_config.cpp b/ydb/core/client/server/msgbus_blobstorage_config.cpp
index b921c314c8f0..67603161fc8b 100644
--- a/ydb/core/client/server/msgbus_blobstorage_config.cpp
+++ b/ydb/core/client/server/msgbus_blobstorage_config.cpp
@@ -40,6 +40,7 @@ class TMessageBusBlobStorageConfig
     TEvBlobStorage::TEvControllerConfigRequest *MakeReq(const TActorContext&) {
         auto ev = MakeHolder<TEvBlobStorage::TEvControllerConfigRequest>();
         auto &record = ev->Record;
+        Request.SetUserSID(GetUserSID());
         Request.Swap(record.MutableRequest());
         return ev.Release();
     }
diff --git a/ydb/core/protos/blobstorage_config.proto b/ydb/core/protos/blobstorage_config.proto
index bbd9cf84cf64..60771c747c86 100644
--- a/ydb/core/protos/blobstorage_config.proto
+++ b/ydb/core/protos/blobstorage_config.proto
@@ -575,6 +575,9 @@ message TConfigRequest {
 
     // is this command originated by self-heal decommission?
     bool IsSelfHealReasonDecommit = 12;
+
+    // requesting user identifier
+    string UserSID = 13;
 }
 
 enum ETriStateBool {