CVE-2025-15493 identifies a SQL injection vulnerability in the RainyGao DocSys product, specifically affecting versions from 2.02.0 through 2.02.36. The vulnerability resides in an unspecified function within the XML mapping file src/com/DocSystem/mapping/ReposAuthMapper.xml, where the 'searchWord' parameter is improperly sanitized or validated. This allows an attacker to inject malicious SQL commands remotely, without requiring authentication or user interaction, thereby enabling unauthorized database queries or modifications. The CVSS 4.0 base score of 5.3 reflects a medium severity, considering the ease of remote exploitation and potential for partial impact on confidentiality, integrity, and availability. The vendor was contacted but has not issued a patch or response, and while an exploit has been published, no confirmed active exploitation has been observed. The vulnerability could be leveraged to extract sensitive information, alter data, or disrupt service availability, depending on the database privileges of the affected application. The lack of vendor response and patch availability increases the urgency for organizations to implement compensating controls. This vulnerability highlights the importance of input validation and secure coding practices in preventing injection flaws in enterprise document management systems.

For European organizations using RainyGao DocSys, this vulnerability poses a significant risk to the confidentiality and integrity of sensitive documents and data managed within the system. Successful exploitation could lead to unauthorized data disclosure, data tampering, or denial of service, potentially disrupting business operations and causing regulatory compliance issues, especially under GDPR. The remote, unauthenticated nature of the exploit increases the attack surface, allowing threat actors to target exposed DocSys instances over the internet. Organizations in sectors such as finance, healthcare, government, and critical infrastructure that rely on DocSys for document management are particularly vulnerable. The absence of a vendor patch means that the risk remains until mitigations are applied, increasing the likelihood of exploitation attempts. Additionally, the medium severity score suggests that while the impact is not catastrophic, the vulnerability could serve as a foothold for further attacks within a compromised network.

Given the lack of an official patch, European organizations should implement immediate compensating controls. These include deploying web application firewalls (WAFs) with rules specifically designed to detect and block SQL injection attempts targeting the 'searchWord' parameter. Network segmentation should be enforced to limit access to DocSys servers, restricting exposure to trusted internal networks only. Conduct thorough input validation and sanitization on all user inputs at the application level, if possible through custom code or middleware. Monitor logs for unusual database queries or error messages indicative of injection attempts. Employ strict least privilege principles for database accounts used by DocSys to minimize potential damage. Regularly back up critical data and test restoration procedures to mitigate impact from potential data corruption. Engage in active threat hunting for signs of exploitation and maintain updated threat intelligence feeds. Finally, organizations should consider reaching out to the vendor for updates and track any future patches or advisories.