CVE-2025-15085 is an improper authorization vulnerability found in the youlaitech youlai-mall e-commerce platform versions 1.0.0 and 2.0.0. The vulnerability resides in the deductBalance function within the Balance Handler component, specifically in the MemberController.java file. This function is responsible for managing user balance deductions, but due to insufficient authorization checks, an attacker can remotely invoke this function to manipulate balances without proper permissions. The vulnerability does not require authentication or user interaction, making it remotely exploitable over the network with low attack complexity. The exploit code has been publicly released, increasing the risk of active exploitation. The vendor was informed early but has not issued any patches or advisories. The CVSS 4.0 vector indicates no privileges required (PR:L), no user interaction (UI:N), and low complexity (AC:L), with a moderate impact on confidentiality, integrity, and availability. This flaw could allow attackers to fraudulently alter financial balances, leading to potential financial losses and undermining trust in the platform. Since the vulnerability affects core financial transaction logic, it poses a significant risk to any organization relying on youlai-mall for payment or balance management.

For European organizations using youlai-mall, this vulnerability could lead to unauthorized financial transactions, fraudulent balance manipulations, and potential monetary losses. E-commerce platforms and online marketplaces relying on this software may suffer reputational damage and customer trust erosion if attackers exploit this flaw to alter user balances. The lack of vendor response and available patches increases exposure time, raising the likelihood of exploitation. Financial institutions or businesses integrating youlai-mall into their payment workflows could face regulatory scrutiny under GDPR and financial compliance frameworks if customer funds are compromised. Additionally, operational disruptions may occur if the platform's balance management is compromised, affecting availability and service continuity. The medium severity rating suggests moderate but tangible risks, especially for organizations with high transaction volumes or critical financial dependencies on the affected software.

Immediate mitigation should focus on conducting a thorough code audit of the deductBalance function and related authorization logic to ensure that only properly authenticated and authorized users can invoke balance deductions. Implement role-based access controls (RBAC) and enforce strict permission checks at the application layer. Network-level protections such as web application firewalls (WAFs) should be configured to detect and block suspicious requests targeting the vulnerable endpoint. Organizations should monitor logs for unusual balance deduction activities and implement anomaly detection to identify potential exploitation attempts. Until an official patch is released, consider isolating or restricting access to the affected component, or temporarily disabling balance deduction functionality if feasible. Engage with the vendor for updates and track public exploit activity closely. Finally, prepare incident response plans to address potential exploitation scenarios promptly.