CVE-2025-56520 identifies a Server-Side Request Forgery (SSRF) vulnerability in Dify version 1.6.0, specifically in the RemoteFileUploadApi component under controllers.console.remote_files. SSRF vulnerabilities occur when an attacker can manipulate a server to send HTTP requests to arbitrary destinations, often internal or protected network resources that are otherwise inaccessible externally. In this case, the vulnerability does not require authentication or user interaction, increasing its risk profile. The CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) indicates network attack vector, low attack complexity, no privileges or user interaction needed, unchanged scope, and limited confidentiality impact only. The vulnerability could allow attackers to access internal services, potentially leading to information disclosure such as metadata services or internal APIs. However, it does not allow modification of data or disruption of service. No patches or exploit code are currently available, and it is distinct from another Dify vulnerability (CVE-2025-29720). The CWE-918 classification confirms the SSRF nature. Organizations using Dify 1.6.0 should evaluate their exposure, especially if the RemoteFileUploadApi is accessible externally or if the server has access to sensitive internal networks.

For European organizations, the primary impact of CVE-2025-56520 is the potential unauthorized disclosure of sensitive internal information due to SSRF exploitation. This could include access to internal APIs, cloud metadata services, or other protected resources, which may lead to further attacks or data leakage. Although the vulnerability does not directly affect data integrity or availability, the confidentiality breach could have regulatory implications under GDPR if personal or sensitive data is exposed. Organizations in sectors such as finance, healthcare, and critical infrastructure, which often use SaaS platforms like Dify for automation or workflow management, may face increased risk. The lack of required authentication or user interaction means attackers can exploit this vulnerability remotely and anonymously, increasing the threat surface. However, the absence of known exploits in the wild and the medium severity score suggest that the immediate risk is moderate but should not be ignored.

To mitigate CVE-2025-56520, organizations should first assess whether they are running Dify version 1.6.0 and if the RemoteFileUploadApi component is exposed to untrusted networks. Network-level controls should be implemented to restrict outbound HTTP requests from the affected server, limiting them to only necessary destinations. Employing strict egress filtering and network segmentation can prevent SSRF from reaching sensitive internal services. Application-level mitigations include validating and sanitizing all user-supplied URLs or inputs that trigger server-side requests, ensuring they cannot be manipulated to access internal resources. Monitoring and logging outbound requests from the application can help detect anomalous behavior indicative of SSRF exploitation attempts. Until an official patch is released, consider disabling or restricting the vulnerable component if feasible. Additionally, conduct regular security assessments and penetration tests focusing on SSRF vectors in your environment.