CVE-2025-10216 is a race condition vulnerability identified in GrandNode versions up to 2.3.0, specifically within the Voucher Handler component located in the /checkout/ConfirmOrder/ file. The vulnerability arises from the manipulation of the argument 'giftvouchercouponcode', which can be exploited to trigger a race condition. A race condition occurs when multiple processes or threads access and manipulate shared data concurrently, leading to unexpected behavior or security flaws. In this case, the vulnerability could potentially allow an attacker to exploit timing issues during the voucher code validation or redemption process. The attack can be launched remotely, but it requires a high level of complexity and is considered difficult to exploit. The CVSS 4.0 base score is 2.1, indicating a low severity level. The vector details show that the attack requires network access (AV:N), high attack complexity (AC:H), no privileges required (PR:L), and user interaction is needed (UI:P). The impact on confidentiality is none, integrity is low, and availability is none. The vendor has not responded to early disclosure attempts, and no patches or known exploits in the wild have been reported. This suggests the vulnerability is currently theoretical or under limited exploitation. GrandNode is an open-source e-commerce platform built on .NET, used by online retailers to manage storefronts, including voucher and coupon management. The race condition in voucher handling could allow attackers to manipulate discount codes or gift vouchers, potentially leading to unauthorized discounts or financial loss for merchants. However, the difficulty of exploitation and low impact score reduce the immediate risk level.

For European organizations using GrandNode as their e-commerce platform, this vulnerability could lead to unauthorized voucher redemption or manipulation, resulting in financial losses and potential reputational damage. Although the severity is low and exploitation is difficult, attackers targeting online retailers could attempt to exploit this race condition to gain improper discounts or disrupt checkout processes. This could affect customer trust and lead to chargebacks or increased operational costs. Additionally, if attackers chain this vulnerability with others, it might escalate impact. The lack of vendor response and patches means organizations must proactively assess and mitigate the risk. Given the increasing reliance on e-commerce in Europe, especially post-pandemic, even low-severity vulnerabilities in payment or discount mechanisms warrant attention to maintain business continuity and customer confidence.

1. Implement application-level locking or synchronization mechanisms around voucher code validation and redemption to prevent concurrent processing issues. 2. Introduce server-side checks to ensure voucher codes cannot be redeemed multiple times simultaneously or beyond allowed limits. 3. Monitor transaction logs for anomalies such as rapid multiple redemptions of the same voucher code. 4. If possible, upgrade to a version of GrandNode that addresses this issue once available or apply community patches if any exist. 5. Employ Web Application Firewalls (WAF) with custom rules to detect and block suspicious patterns targeting voucher parameters. 6. Conduct thorough code reviews and penetration testing focusing on concurrency and race conditions in the checkout and voucher handling modules. 7. Educate development teams about secure coding practices related to concurrency and race conditions. 8. Consider temporarily disabling gift voucher functionality if exploitation risk is deemed unacceptable until a fix is available.