CVE-2025-61768 is a Server-Side Request Forgery (SSRF) vulnerability identified in the KUNO CMS, a full-stack blog application developed by xuemian168. The flaw exists in versions prior to 1.3.15 within the Media module of the administrative panel. Specifically, the vulnerability arises when a logged-in administrator uploads an SVG file containing an external image reference. SVG files can embed external resources, and the CMS fails to properly validate or sanitize these references, leading the server to initiate outbound HTTP requests to arbitrary URLs specified in the SVG. This behavior can be exploited to perform internal network scanning, access internal-only services, or cause information disclosure about the internal network topology or sensitive resources. The vulnerability is classified under CWE-20 (Improper Input Validation), CWE-434 (Unrestricted Upload of File with Dangerous Type), and CWE-918 (Server-Side Request Forgery). The CVSS 4.0 base score is 5.1 (medium severity), reflecting that exploitation requires administrative privileges but no user interaction, with low complexity and limited impact on confidentiality and availability. The vulnerability was publicly disclosed on October 6, 2025, and fixed in KUNO CMS version 1.3.15. No known exploits have been reported in the wild to date. The issue highlights the risks of insufficient input validation and unsafe handling of SVG files in web applications, especially those with administrative upload capabilities.

For European organizations using KUNO CMS versions prior to 1.3.15, this vulnerability poses a risk of internal network reconnaissance and potential information disclosure. An attacker with administrative access could leverage the SSRF to probe internal services that are otherwise inaccessible externally, potentially identifying vulnerable internal systems or extracting sensitive metadata. While the vulnerability does not directly allow remote code execution or privilege escalation, the information gained could facilitate further attacks or lateral movement within the network. This is particularly concerning for organizations with segmented networks or sensitive internal services protected behind firewalls. The requirement for administrative privileges limits the attack surface but does not eliminate risk, especially in environments with multiple administrators or where credentials may be compromised. The impact on confidentiality and availability is low to moderate, but the potential for indirect exploitation increases the overall risk. European entities relying on KUNO CMS for blogging or content management should consider the threat significant enough to warrant immediate remediation to prevent reconnaissance and data leakage.

The primary mitigation is to upgrade KUNO CMS to version 1.3.15 or later, where the vulnerability has been patched. Organizations should enforce strict access controls on the administrative panel to limit the number of users with upload privileges. Implement network segmentation and egress filtering to restrict outbound HTTP requests from the CMS server, minimizing the impact of SSRF attempts. Additionally, configure web application firewalls (WAFs) to detect and block suspicious SVG uploads or outbound requests to untrusted domains. Administrators should audit uploaded media files for embedded external references and sanitize SVG content before processing. Monitoring and logging outbound connections from the CMS server can help detect anomalous activity indicative of exploitation attempts. Finally, conduct regular security training for administrators to recognize and avoid risky file uploads and maintain strong credential hygiene to prevent unauthorized access.