CVE-2025-5327 is a Server-Side Request Forgery (SSRF) vulnerability identified in version 2.7 of the chshcms mccms content management system. The vulnerability exists in the 'index' function of the file located at sys/apps/controllers/api/Gf.php. Specifically, the issue arises from improper validation and sanitization of the 'pic' argument, which an attacker can manipulate to force the server to make arbitrary HTTP requests. This SSRF flaw allows a remote attacker to coerce the vulnerable server into sending requests to internal or external systems that the attacker would otherwise not have direct access to. The vulnerability is exploitable remotely without requiring user interaction or authentication, increasing its risk profile. Although the vendor was notified early, no response or patch has been issued, and a public exploit has been disclosed, raising the likelihood of exploitation. The CVSS 4.0 score is 5.3 (medium severity), reflecting the vulnerability's moderate impact on confidentiality, integrity, and availability, with low complexity and no privileges or user interaction needed. However, the vector indicates limited impact on confidentiality, integrity, and availability, suggesting that while the SSRF can be leveraged for reconnaissance or indirect attacks, it may not directly lead to full system compromise without additional chained exploits. The absence of a patch and public exploit availability make this a significant concern for organizations using chshcms mccms 2.7, especially those exposing the vulnerable API endpoint to untrusted networks.

For European organizations using chshcms mccms 2.7, this SSRF vulnerability poses several risks. Attackers can exploit it to access internal network resources, potentially bypassing firewalls and network segmentation. This could lead to unauthorized access to sensitive internal services such as databases, metadata services in cloud environments, or internal APIs, resulting in data leakage or further compromise. Additionally, SSRF can be a pivot point for launching further attacks like remote code execution if chained with other vulnerabilities. The lack of vendor response and patch increases exposure time, raising the risk of exploitation. Organizations in sectors with sensitive data (e.g., finance, healthcare, government) are particularly vulnerable to reputational damage and regulatory penalties if internal data is exposed or systems are compromised. Moreover, the ability to initiate SSRF remotely without authentication means attackers can scan and probe internal networks stealthily, complicating detection and response efforts.

To mitigate this vulnerability, European organizations should: 1) Immediately audit their use of chshcms mccms 2.7 and identify any exposed instances of the vulnerable API endpoint (sys/apps/controllers/api/Gf.php). 2) Implement strict input validation and sanitization on the 'pic' parameter to block malicious URLs or IP addresses, ideally using allowlists for permitted domains and protocols. 3) Employ network-level controls such as firewall rules or proxy restrictions to prevent the web server from making unauthorized outbound requests, especially to internal IP ranges or sensitive services. 4) Monitor logs for unusual outbound HTTP requests originating from the application server that could indicate SSRF attempts. 5) If feasible, isolate the application server in a segmented network zone with minimal access to internal resources. 6) Engage in active threat hunting for signs of exploitation given the public availability of exploits. 7) Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block SSRF patterns targeting the vulnerable parameter. 8) As no official patch exists, consider temporary workarounds such as disabling the vulnerable API endpoint or restricting access to trusted IPs until a vendor patch or update is available.