CVE-2025-11630 is a path traversal vulnerability identified in the RainyGao DocSys application, specifically in the updateRealDoc function of the /Doc/uploadDoc.do endpoint, which handles file uploads. The vulnerability arises from insufficient validation or sanitization of the 'path' parameter, allowing an attacker to manipulate this argument to traverse directories outside the intended upload folder. This can lead to unauthorized reading or writing of arbitrary files on the server's file system. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing the risk of automated exploitation. The vendor was informed early but has not issued a patch or mitigation guidance, and public exploit code is available, increasing the likelihood of exploitation. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low attack complexity, no user interaction, and partial impact on confidentiality, integrity, and availability. The vulnerability affects all versions of DocSys up to 2.02.36, covering a wide range of deployed instances. Without a patch, attackers can leverage this flaw to compromise sensitive documents, alter system files, or disrupt service availability, posing significant risks to organizations relying on DocSys for document management.

For European organizations, this vulnerability poses a moderate risk to the confidentiality, integrity, and availability of document management systems. Unauthorized file access or modification could lead to data breaches involving sensitive corporate or personal information, regulatory non-compliance (e.g., GDPR), and operational disruptions. Organizations in sectors such as finance, healthcare, legal, and government, which often use document management solutions, could face reputational damage and financial penalties. The remote exploitability without authentication increases the risk of widespread automated attacks, especially given the public availability of exploit code. The lack of vendor response and patch availability exacerbates the threat, forcing organizations to rely on defensive measures. Additionally, attackers could use this vulnerability as a foothold for further network compromise, lateral movement, or deployment of ransomware. The impact is heightened in environments where DocSys is integrated with other critical systems or stores highly sensitive documents.

1. Immediately restrict external access to the /Doc/uploadDoc.do endpoint using network segmentation or firewall rules to limit exposure. 2. Deploy web application firewalls (WAFs) with custom rules to detect and block path traversal patterns in HTTP requests targeting the vulnerable parameter. 3. Implement strict input validation and sanitization at the application or proxy level to reject suspicious path arguments. 4. Monitor file system integrity and audit logs for unauthorized file access or modifications, focusing on directories accessible by DocSys. 5. If possible, disable or restrict the updateRealDoc functionality temporarily until a patch is available. 6. Conduct thorough inventory and risk assessment to identify all instances of DocSys in the environment. 7. Engage with the vendor for updates and consider alternative document management solutions if no timely patch is forthcoming. 8. Educate security teams on the vulnerability and ensure incident response plans include scenarios involving path traversal exploitation. 9. Regularly update and patch other system components to reduce overall attack surface and prevent lateral movement. 10. Consider deploying endpoint detection and response (EDR) tools to detect exploitation attempts and anomalous file system activity.