CVE-2025-12854 is a medium-severity authorization bypass vulnerability identified in newbee-mall-plus, an e-commerce platform, affecting versions 2.4.0 and 2.4.1. The vulnerability exists in the executeSeckill function within the /seckillExecution/ endpoint, where the userid parameter is improperly validated. This flaw allows remote attackers to manipulate the userid argument to bypass authorization checks, potentially enabling unauthorized execution of seckill (flash sale) operations. The attack vector is network-based (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and no authentication (AT:N). However, the attack complexity is high (AC:H), indicating that exploitation requires significant effort or knowledge. The vulnerability impacts the integrity of transactions by allowing unauthorized actions but does not affect confidentiality or availability directly. Although an exploit is publicly available, no known active exploitation in the wild has been reported. The vulnerability is rated with a CVSS 4.0 score of 6.3, reflecting medium severity. The lack of authentication requirement and the remote attack vector make this a notable risk for organizations relying on newbee-mall-plus for e-commerce operations. The vulnerability highlights the importance of proper authorization checks and input validation in critical business functions like seckill execution.

For European organizations using newbee-mall-plus, this vulnerability poses a risk to the integrity of e-commerce transactions, particularly those involving flash sales or limited-time offers. Unauthorized users could bypass authorization controls to execute seckill operations, potentially leading to fraudulent purchases, inventory manipulation, or financial losses. This could damage customer trust and result in regulatory scrutiny under data protection and consumer protection laws such as GDPR. The medium severity and high complexity of exploitation reduce the likelihood of widespread attacks but do not eliminate the risk, especially from skilled threat actors targeting high-value transactions. Organizations operating in sectors with high e-commerce activity, such as retail and logistics, may face operational disruptions or reputational damage if exploited. Additionally, the public availability of an exploit increases the risk of opportunistic attacks. The vulnerability does not directly impact confidentiality or availability but undermines transactional integrity, which is critical for business continuity and compliance.

1. Upgrade newbee-mall-plus to a version where this vulnerability is patched once available, or apply vendor-provided patches immediately. 2. Implement strict server-side input validation and sanitization for the userid parameter in the executeSeckill function to prevent unauthorized manipulation. 3. Enforce robust authorization checks ensuring that the userid corresponds to the authenticated user context before processing seckill requests. 4. Monitor and log access to the /seckillExecution/ endpoint for anomalous patterns, such as repeated requests with manipulated userid values. 5. Employ Web Application Firewalls (WAF) with custom rules to detect and block suspicious requests targeting this vulnerability. 6. Conduct regular security assessments and code reviews focusing on authorization logic in critical e-commerce functions. 7. Educate development teams on secure coding practices related to authorization and input validation. 8. Consider implementing multi-factor authentication or additional verification steps for high-value transactions to mitigate unauthorized actions.