CVE-2025-5326 is a deserialization vulnerability identified in version 1.0.0 of the ADP Application Developer Platform (应用开发者平台) developed by zhilink 智互联(深圳)科技有限公司. The vulnerability exists in an unspecified functionality related to the file path /adpweb/wechat/verifyToken/. Deserialization vulnerabilities occur when untrusted data is processed by an application to reconstruct objects, which can lead to arbitrary code execution, privilege escalation, or other malicious activities if the data is crafted maliciously. In this case, the vulnerability allows remote attackers to manipulate serialized data without authentication or user interaction, potentially leading to unauthorized actions within the platform. The CVSS 4.0 base score is 5.3, indicating a medium severity level, with the vector showing network attack vector (AV:N), low attack complexity (AC:L), no authentication required (AT:N), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). The vendor was notified but has not responded or issued a patch, and no known exploits are currently observed in the wild. The public disclosure of the exploit increases the risk of exploitation, especially in environments where this platform is deployed and exposed to untrusted networks. The platform is used for application development, likely integrating with WeChat services, which may be critical for organizations relying on this ecosystem for business operations or customer engagement.

For European organizations using the zhilink ADP Application Developer Platform, this vulnerability poses a risk of unauthorized remote code execution or manipulation of application logic, potentially leading to data breaches, service disruption, or unauthorized access to sensitive business functions. Given the platform's role in application development and integration with WeChat, exploitation could compromise applications that handle customer data, payment processing, or internal workflows. The medium severity rating suggests that while the impact on confidentiality, integrity, and availability is limited, the ease of exploitation without authentication and user interaction increases the threat level. Organizations in sectors such as technology, finance, and e-commerce that rely on this platform for their digital services could face operational disruptions and reputational damage if exploited. Additionally, the lack of vendor response and absence of patches heightens the urgency for organizations to implement mitigations proactively.

European organizations should immediately conduct an inventory to identify any deployments of the zhilink ADP Application Developer Platform version 1.0.0, especially those exposed to external networks. Since no official patch is available, organizations should consider the following mitigations: 1) Implement strict network segmentation and firewall rules to restrict access to the /adpweb/wechat/verifyToken/ endpoint, limiting it to trusted internal IPs only. 2) Deploy Web Application Firewalls (WAF) with custom rules to detect and block suspicious serialized payloads or anomalous requests targeting the vulnerable endpoint. 3) Monitor logs for unusual activity related to deserialization or unexpected requests to the affected path. 4) If feasible, disable or restrict the use of the vulnerable functionality until a vendor patch is released. 5) Engage with the vendor for updates and consider alternative platforms if the vendor remains unresponsive. 6) Conduct security assessments and penetration testing focused on deserialization vulnerabilities to identify other potential weaknesses. 7) Educate development and security teams about the risks of insecure deserialization and best practices for secure coding.