CVE-2025-11631 is a path traversal vulnerability identified in the RainyGao DocSys product, affecting all versions up to 2.02.36. The vulnerability resides in the /Doc/deleteDoc.do endpoint, where the 'path' parameter is insufficiently validated, allowing an attacker to manipulate the argument to traverse directories outside the intended scope. This can lead to unauthorized deletion or access of files on the server hosting DocSys. The attack vector is remote network access, requiring low privileges but no authentication or user interaction, making exploitation feasible in exposed environments. The vulnerability has been publicly disclosed, but the vendor has not responded or provided patches, increasing the risk of exploitation. The CVSS 4.0 base score of 5.3 indicates a medium severity, with the main impact being on availability and limited integrity impact due to potential file deletions. No known exploits are currently active in the wild, but the public disclosure and lack of vendor response suggest that attackers could develop exploits. The vulnerability does not involve confidentiality compromise directly but could disrupt document management operations by deleting critical files. The lack of scope change and no requirement for user interaction reduce the overall severity but still pose a significant risk to organizations relying on DocSys for document handling.

For European organizations, this vulnerability could lead to unauthorized deletion or access of sensitive documents managed by RainyGao DocSys, potentially disrupting business operations and causing data loss. Organizations in sectors such as legal, finance, healthcare, and government that rely on document management systems are particularly vulnerable to operational impact. The ability to exploit this remotely without authentication increases the attack surface, especially for systems exposed to the internet or poorly segmented internal networks. While the confidentiality impact is limited, the integrity and availability of critical documents could be compromised, leading to compliance issues with GDPR and other data protection regulations if sensitive data is lost or improperly handled. The lack of vendor response and patch availability means organizations must rely on internal mitigations, increasing operational risk. The medium severity rating suggests that while the threat is not critical, it should be addressed promptly to avoid potential exploitation and service disruption.

1. Immediately restrict external access to the /Doc/deleteDoc.do endpoint using network-level controls such as firewalls or VPNs to limit exposure. 2. Implement strict input validation and sanitization on the 'path' parameter at the application or web server level to prevent directory traversal sequences (e.g., ../). 3. Employ web application firewalls (WAFs) with custom rules to detect and block path traversal attempts targeting DocSys. 4. Conduct thorough audits of file system permissions to ensure the DocSys service account has the minimum necessary privileges, limiting potential damage from exploitation. 5. Monitor logs for unusual access patterns or deletion requests to the /Doc/deleteDoc.do endpoint to detect potential exploitation attempts early. 6. If possible, isolate the DocSys application in a segmented network zone to reduce lateral movement risks. 7. Engage with the vendor or community to track any forthcoming patches or updates and plan for timely application once available. 8. Consider deploying temporary compensating controls such as disabling the vulnerable functionality if business operations allow. 9. Educate IT and security teams about this vulnerability to ensure rapid response to any suspicious activity related to DocSys.