CVE-2025-12854 is a medium-severity authorization bypass vulnerability affecting newbee-mall-plus, an e-commerce platform, in versions 2.4.0 and 2.4.1. The vulnerability resides in the executeSeckill function within the /seckillExecution/ endpoint. By manipulating the userid parameter, an attacker can bypass authorization controls and perform actions reserved for authenticated users without needing any authentication or user interaction. This flaw allows unauthorized users to initiate seckill transactions, potentially enabling fraudulent purchases or manipulation of flash sale events. The attack vector is remote network access, and while the exploit is publicly available, the attack complexity is high, indicating that exploitation requires significant effort or specific conditions. The CVSS 4.0 vector indicates no privileges required, no user interaction, and no impact on confidentiality or availability, but a low impact on integrity, reflecting the ability to perform unauthorized actions. No patches or fixes are currently linked, and no known exploits in the wild have been reported, but the presence of a public exploit increases the risk of future attacks. The vulnerability highlights weaknesses in input validation and authorization logic within the seckill execution process, a critical component for e-commerce platforms handling high-volume flash sales.

For European organizations using newbee-mall-plus, this vulnerability could lead to unauthorized transactions during flash sales, resulting in financial losses, reputational damage, and disruption of sales processes. Attackers could manipulate userid parameters to bypass authorization, potentially enabling fraudulent purchases or denial of legitimate customer transactions. While confidentiality and availability impacts are minimal, the integrity of transaction processes is compromised, which can undermine customer trust and lead to regulatory scrutiny under GDPR if customer data or transaction records are affected. The medium severity and high attack complexity reduce immediate widespread exploitation risk, but the availability of public exploits means targeted attacks against vulnerable installations are plausible. E-commerce businesses in Europe relying on this platform for critical sales events are particularly at risk, especially during high-traffic periods where seckill features are heavily used.

European organizations should immediately audit their newbee-mall-plus installations to identify affected versions (2.4.0 and 2.4.1). In the absence of an official patch, implement strict server-side validation of the userid parameter to ensure it matches the authenticated user's identity. Enhance authorization checks within the executeSeckill function to enforce proper access controls and prevent parameter tampering. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting the /seckillExecution/ endpoint, especially those with manipulated userid values. Monitor logs for unusual seckill execution patterns or repeated unauthorized attempts. Consider temporarily disabling the seckill feature during critical sales periods until a patch is available. Engage with the vendor or community for updates and patches, and plan for prompt deployment once released. Additionally, conduct penetration testing focused on authorization controls to identify similar weaknesses.