Index: ChapterX.Application/Comment/Commands/DeleteHandler.cs
===================================================================
--- ChapterX.Application/Comment/Commands/DeleteHandler.cs	(revision 877c13c3dd0934c1d31da7988d0d2c2c5925ed55)
+++ ChapterX.Application/Comment/Commands/DeleteHandler.cs	(revision b373fea3e2c9d404606002f8e7ba265a82d68187)
@@ -22,4 +22,7 @@
                 return new DeleteResponse(false);
 
+            if (comment.UserId != request.CallerId)
+                throw new UnauthorizedAccessException("You do not own this comment.");
+
             await _commentRepository.DeleteAsync(comment, cancellationToken);