CVE-2025-10211 is a Server-Side Request Forgery (SSRF) vulnerability identified in the ChanCMS content management system, specifically version 3.3.0 developed by yanyutao0402. The vulnerability exists in the CollectController function within the /cms/collect/getArticle endpoint. The issue arises from improper validation or sanitization of the 'taskUrl' parameter, which an attacker can manipulate to force the server to make unauthorized HTTP requests to arbitrary URLs. This SSRF flaw allows remote attackers to potentially access internal resources, bypass firewalls, or interact with backend services that are otherwise inaccessible externally. The vulnerability does not require user interaction or authentication, making it remotely exploitable over the network. The vendor was notified but did not respond or provide a patch, and public exploit code has been disclosed, increasing the risk of exploitation. The CVSS 4.0 base score is 5.3 (medium severity), reflecting moderate impact on confidentiality, integrity, and availability with low attack complexity and no privileges required. However, the vulnerability's impact can vary depending on the internal network architecture and the sensitivity of the resources accessible via SSRF. Since no patch is currently available, organizations using ChanCMS 3.3.0 remain exposed to potential SSRF attacks that could lead to information disclosure, internal network reconnaissance, or further exploitation chains.

For European organizations using ChanCMS 3.3.0, this SSRF vulnerability poses a tangible risk to internal network security and data confidentiality. Attackers could leverage the SSRF flaw to probe internal services, access sensitive internal APIs, or exfiltrate data from protected environments. This is particularly concerning for organizations hosting sensitive content or critical infrastructure on ChanCMS, such as government agencies, educational institutions, or enterprises managing confidential data. The vulnerability could also be used as a pivot point for lateral movement within corporate networks, potentially leading to broader compromise. Given the lack of vendor response and patch, European entities relying on this CMS must assume ongoing exposure. The medium CVSS score indicates moderate risk, but the ease of exploitation and public availability of exploits could elevate the threat level in practice. Additionally, SSRF can sometimes be chained with other vulnerabilities to escalate privileges or cause denial of service, amplifying the impact. Organizations with strict data protection requirements under GDPR should be particularly vigilant, as exploitation could lead to data breaches and regulatory penalties.

Since no official patch is available from the vendor, European organizations should implement immediate compensating controls. First, restrict outbound HTTP requests from the ChanCMS server using network-level controls such as firewall rules or proxy configurations to limit the server's ability to reach unauthorized internal or external endpoints. Second, implement strict input validation and sanitization on the 'taskUrl' parameter at the application or web server level, potentially using web application firewalls (WAFs) to detect and block suspicious SSRF payloads. Third, monitor server logs and network traffic for unusual request patterns indicative of SSRF exploitation attempts. Fourth, consider isolating the CMS server within a segmented network zone with minimal access to sensitive internal resources. Finally, plan to upgrade or migrate away from ChanCMS 3.3.0 to a more secure platform or await vendor updates, while maintaining regular backups and incident response readiness. Organizations should also educate their security teams about SSRF risks and detection techniques to improve response capabilities.