CVE-2025-11630 is a path traversal vulnerability identified in the RainyGao DocSys document management system, affecting all versions up to 2.02.36. The flaw resides in the updateRealDoc function within the /Doc/uploadDoc.do endpoint, which handles file uploads. An attacker can remotely manipulate the 'path' parameter to traverse directories outside the intended upload directory, potentially accessing or overwriting arbitrary files on the server. This vulnerability does not require user interaction and can be exploited with low privileges, increasing its risk profile. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and impacts on confidentiality, integrity, and availability at a low level (VC:L, VI:L, VA:L). Despite early notification, the vendor has not issued a patch or mitigation guidance, and public exploit code is available, raising the risk of exploitation. The vulnerability could lead to unauthorized disclosure of sensitive documents, modification or deletion of files, and potential further compromise of the affected system. The lack of vendor response and patch availability necessitates immediate attention from users of DocSys to implement compensating controls.

For European organizations, exploitation of this vulnerability could result in unauthorized access to sensitive documents and internal files, leading to breaches of confidentiality and integrity. Given that DocSys is a document management system, attackers could exfiltrate intellectual property, personal data protected under GDPR, or manipulate documents to disrupt business operations. The ability to overwrite files could also enable attackers to implant malicious code or disrupt availability. This risk is heightened in sectors with stringent data protection requirements such as finance, healthcare, and government institutions. The absence of a vendor patch increases exposure time, and public exploit availability lowers the barrier for attackers. Organizations relying on RainyGao DocSys for critical document workflows face potential regulatory penalties and reputational damage if exploited. Additionally, the vulnerability could be leveraged as a foothold for lateral movement within networks, amplifying the overall threat.

Since no official patch is available, European organizations should implement the following specific mitigations: 1) Immediately restrict access to the /Doc/uploadDoc.do endpoint via network segmentation and firewall rules to limit exposure to trusted IPs only. 2) Employ web application firewalls (WAFs) with custom rules to detect and block path traversal patterns in the 'path' parameter. 3) Conduct thorough input validation and sanitization on all file upload parameters, enforcing strict allowlists for file paths and names. 4) Monitor server logs for unusual file access or upload activity indicative of traversal attempts. 5) Isolate the document storage directories with strict filesystem permissions to prevent unauthorized file access or modification. 6) Consider deploying runtime application self-protection (RASP) solutions to detect and block exploitation attempts in real time. 7) Prepare incident response plans specifically addressing potential data breaches stemming from this vulnerability. 8) Engage with the vendor for updates and consider alternative document management solutions if remediation is delayed. 9) Regularly audit and backup critical documents to enable recovery in case of tampering or deletion.