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 manipulation of the 'path' parameter allows an attacker to traverse directories outside the intended scope. This can lead to unauthorized file access or deletion on the server hosting DocSys. The attack vector is network-based (AV:N), requiring low attack complexity (AC:L) and no privileges (PR:L) or user interaction (UI:N). The vulnerability impacts confidentiality and integrity to a limited extent (VC:N, VI:L, VA:L), with no impact on availability or scope changes. The vendor was notified early but has not issued a patch or response, and no known exploits have been observed in the wild yet. The public disclosure of the exploit code increases the risk of exploitation by threat actors. The vulnerability is significant because document management systems often contain sensitive organizational data, and unauthorized file deletion or access could disrupt business operations or lead to data breaches. The lack of authentication requirements and the ability to launch attacks remotely make this vulnerability a notable risk for affected deployments.

For European organizations using RainyGao DocSys, this vulnerability poses risks to data confidentiality and integrity. Attackers could access or delete sensitive documents, potentially leading to data breaches, loss of critical information, or disruption of document workflows. This could affect compliance with GDPR and other data protection regulations, resulting in legal and financial consequences. The ability to exploit the vulnerability remotely without user interaction or elevated privileges increases the attack surface, especially for organizations exposing DocSys to the internet or within less secure internal networks. The lack of vendor response and patches means organizations must rely on internal mitigations, increasing operational risk. Industries with high reliance on document management, such as legal, financial, healthcare, and government sectors, are particularly vulnerable. Additionally, the potential for attackers to leverage this vulnerability as a foothold for further attacks cannot be discounted, especially in environments with interconnected systems.

1. Immediately restrict external access to the /Doc/deleteDoc.do endpoint using network-level controls such as firewalls or VPNs. 2. Implement strict input validation and sanitization on the 'path' parameter 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 endpoints. 4. Conduct thorough audits of file system permissions to ensure the DocSys process has minimal privileges, limiting potential damage from exploitation. 5. Monitor logs for unusual access patterns or repeated requests to /Doc/deleteDoc.do with suspicious path parameters. 6. If possible, isolate the DocSys server in a segmented network zone to reduce lateral movement risks. 7. Engage with the vendor for updates or patches and consider alternative document management solutions if no remediation is forthcoming. 8. Develop an incident response plan specific to this vulnerability, including backup and recovery procedures for critical documents. 9. Educate IT and security teams about this vulnerability and the importance of timely patching and monitoring.