A security flaw has been discovered in youlaitech youlai-mall 1.0.0/2.0.0. This affects the function deductBalance of the file mall-ums/ums-boot/src/main/java/com/youlai/mall/ums/controller/app/MemberController.java of the component Balance Handler. The manipulation results in improper authorization. The attack can be launched remotely. The exploit has been released to the public and may be exploited. The vendor was contacted early about this disclosure but did not respond in any way.