CVE-2025-56520 is a Server-Side Request Forgery (SSRF) vulnerability identified in Dify version 1.6.0, specifically within the component controllers.console.remote_files.RemoteFileUploadApi. SSRF vulnerabilities occur when an attacker can manipulate a server to make unintended requests to internal or external systems, potentially bypassing network access controls. In this case, the vulnerability allows an attacker to exploit the RemoteFileUploadApi component to induce the server to send crafted requests to arbitrary locations. This can lead to unauthorized internal network scanning, access to sensitive internal resources, or interaction with other services that are not directly exposed to the attacker. The vulnerability is distinct from CVE-2025-29720, indicating multiple security issues in Dify. No CVSS score has been assigned yet, and no known exploits are currently reported in the wild. The lack of patch links suggests that a fix may not yet be publicly available or disclosed. Given the nature of SSRF, the vulnerability could be leveraged to pivot attacks within a network, access metadata services, or perform reconnaissance, depending on the deployment environment of Dify. The absence of detailed affected versions beyond 1.6.0 limits precise scope assessment, but the presence in a remote file upload API component indicates that the vulnerability could be triggered remotely, potentially without authentication if the API is exposed or insufficiently protected.

For European organizations using Dify v1.6.0, this SSRF vulnerability poses a significant risk to internal network security and data confidentiality. If exploited, attackers could access internal services that are otherwise protected by network segmentation or firewalls, potentially leading to data leakage, unauthorized access to internal APIs, or further exploitation chains such as privilege escalation or lateral movement. Organizations in sectors with stringent data protection requirements, such as finance, healthcare, and critical infrastructure, could face compliance violations and reputational damage if internal data is exposed. Additionally, SSRF can be a stepping stone for more complex attacks, including cloud metadata service exploitation in cloud-hosted environments, which are common in European enterprises. The lack of known exploits currently reduces immediate risk, but the public disclosure of the vulnerability increases the likelihood of future exploitation attempts. The impact is heightened if the vulnerable API is accessible from the internet or poorly segmented internal networks.

European organizations should immediately audit their use of Dify, particularly version 1.6.0, and assess exposure of the RemoteFileUploadApi component. Until a patch is available, organizations should implement strict access controls to limit API exposure, such as network segmentation, firewall rules restricting outbound requests from the server, and IP whitelisting. Input validation and sanitization should be enforced to restrict URLs or destinations that the RemoteFileUploadApi can access, ideally allowing only trusted internal endpoints. Monitoring and logging of outbound requests from the server should be enhanced to detect anomalous or unauthorized request patterns indicative of SSRF exploitation attempts. If feasible, disabling or restricting the vulnerable component until a vendor patch is released is advisable. Organizations should also stay updated with vendor advisories for patches and apply them promptly once available. Conducting penetration testing focused on SSRF vectors in the affected environment can help identify exploitation attempts and validate mitigations.