diff --git a/backend/open_webui/routers/retrieval.py b/backend/open_webui/routers/retrieval.py
index 44b570ff6..4c27ffea4 100644
--- a/backend/open_webui/routers/retrieval.py
+++ b/backend/open_webui/routers/retrieval.py
@@ -2757,6 +2757,27 @@ async def process_files_batch(
 
     for file in form_data.files:
         try:
+            # Ownership check: verify the requesting user owns the file or is an admin
+            db_file = Files.get_file_by_id(file.id)
+            if not db_file:
+                file_errors.append(
+                    BatchProcessFilesResult(
+                        file_id=file.id,
+                        status="failed",
+                        error="File not found",
+                    )
+                )
+                continue
+            if db_file.user_id != user.id and user.role != "admin":
+                file_errors.append(
+                    BatchProcessFilesResult(
+                        file_id=file.id,
+                        status="failed",
+                        error="Permission denied: not file owner",
+                    )
+                )
+                continue
+
             text_content = file.data.get("content", "")
             docs: List[Document] = [
                 Document(