CVE-2025-15373 is a Server-Side Request Forgery (SSRF) vulnerability identified in EyouCMS, a content management system, specifically affecting versions 1.7.0 through 1.7.7. The vulnerability resides in the saveRemote function within the application/function.php file. SSRF vulnerabilities allow an attacker to induce the server to make HTTP requests to arbitrary domains, including internal or protected network resources that are otherwise inaccessible externally. This can lead to unauthorized access to internal services, data leakage, or further exploitation such as port scanning or exploitation of other internal vulnerabilities. The vulnerability can be triggered remotely without requiring authentication or user interaction, increasing its risk profile. The vendor has acknowledged the issue and plans to release a patched version 1.7.8. The CVSS 4.0 base score is 5.3 (medium), reflecting network attack vector, low attack complexity, no privileges or user interaction required, and limited impact on confidentiality, integrity, and availability. No known exploits are currently reported in the wild, but public disclosure increases the likelihood of exploitation attempts. The vulnerability’s presence in a widely used CMS makes it a notable risk for organizations relying on EyouCMS for web content management.

For European organizations, exploitation of this SSRF vulnerability could lead to unauthorized internal network reconnaissance, access to sensitive internal services, or data exfiltration. This is particularly concerning for organizations hosting critical infrastructure, government portals, or private intranet services behind the CMS. The ability to perform SSRF without authentication means attackers can potentially pivot from the public-facing CMS to internal systems, bypassing perimeter defenses. This could result in confidentiality breaches, integrity violations if internal services are manipulated, or availability issues if internal resources are overwhelmed or misused. The medium severity indicates moderate risk, but the actual impact depends on the internal network architecture and the sensitivity of accessible internal resources. Organizations in sectors such as finance, healthcare, and public administration in Europe could face increased risk if EyouCMS is deployed without timely patching.

1. Immediately upgrade EyouCMS installations to version 1.7.8 once released by the vendor to apply the official patch. 2. Until patching is possible, implement network-level controls to restrict the CMS server’s outbound HTTP requests, limiting them to only necessary external endpoints. 3. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious SSRF patterns targeting the saveRemote function. 4. Conduct internal network segmentation to minimize the exposure of sensitive services to the CMS server. 5. Monitor server logs for unusual outbound requests or anomalies indicative of SSRF exploitation attempts. 6. Review and harden CMS configurations to disable or restrict remote resource fetching features if not required. 7. Educate security teams about this vulnerability and ensure incident response plans include SSRF attack scenarios. These targeted steps go beyond generic advice by focusing on network controls, monitoring, and configuration hardening specific to the nature of this vulnerability.