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 stems from improper input validation (CWE-20) when processing SVG files uploaded by administrators. SVG files can contain external image references, and if these references are not properly sanitized, the server will initiate outbound HTTP requests to attacker-controlled or arbitrary URLs. This behavior can be exploited by a logged-in administrator who uploads a malicious SVG file, causing the server to perform unintended network requests. The consequences include potential internal network reconnaissance, information disclosure about internal services, or interaction with external malicious endpoints. The vulnerability does not require user interaction beyond the upload and does not affect unauthenticated users, limiting its attack surface. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required beyond administrator (PR:H), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:N, VA:L). The issue was addressed in KUNO CMS version 1.3.15 by implementing proper input validation and sanitization of SVG external references to prevent SSRF. No public exploits have been reported yet, but the presence of SSRF in administrative functionality poses a moderate risk, especially in environments where internal network security is critical.

For European organizations, the SSRF vulnerability in KUNO CMS can lead to unauthorized internal network scanning and information disclosure, which may facilitate further attacks such as lateral movement or data exfiltration. Since exploitation requires administrative access, the threat is more significant in environments with weak administrative credential management or where insider threats exist. The vulnerability could expose sensitive internal services that are not otherwise accessible externally, undermining network segmentation and perimeter defenses. Organizations using KUNO CMS for critical blogging or content management, especially those integrated with internal systems or containing sensitive data, face risks of confidentiality breaches and potential service disruptions. The moderate CVSS score reflects that while the vulnerability is not trivially exploitable by outsiders, it can be leveraged by attackers who have already compromised administrative credentials, increasing the overall risk posture. Additionally, the SSRF could be used to bypass firewall rules or access cloud metadata services if hosted in cloud environments, amplifying potential damage.

European organizations should immediately upgrade KUNO CMS installations to version 1.3.15 or later, which contains the fix for this SSRF vulnerability. Until upgrade is possible, restrict administrative access to trusted personnel only and enforce strong multi-factor authentication to reduce the risk of credential compromise. Implement network-level egress filtering to limit outbound HTTP requests from the CMS server, preventing unauthorized external connections initiated by SSRF. Monitor server logs for unusual outbound requests, especially those originating from the Media module or related to SVG file processing. Conduct regular audits of uploaded media files to detect suspicious SVG content with external references. Employ web application firewalls (WAFs) with rules targeting SSRF patterns and SVG file uploads. Additionally, isolate the CMS server within a segmented network zone with minimal access to sensitive internal resources to contain potential SSRF exploitation impact. Finally, educate administrators on secure file upload practices and the risks associated with SVG files containing external references.