CVE-2025-8228 is a Server-Side Request Forgery (SSRF) vulnerability identified in the ChanCMS content management system developed by yanyutao0402, affecting versions up to 3.1.2. The vulnerability resides in the getPages function within the /cms/collect/getPages endpoint, where the targetUrl parameter is insufficiently validated or sanitized. This flaw allows an attacker to manipulate the targetUrl argument to coerce the server into making arbitrary HTTP requests to internal or external resources. SSRF vulnerabilities can be exploited remotely without user interaction or authentication, enabling attackers to access internal services, bypass firewalls, or perform reconnaissance on internal networks. The disclosed exploit indicates that the vulnerability is publicly known, although no active exploitation in the wild has been reported yet. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the network attack vector, low attack complexity, no privileges or user interaction required, but limited impact on confidentiality, integrity, and availability. The vendor has addressed this issue in version 3.1.3, and upgrading is recommended to mitigate the risk. The vulnerability does not involve code execution directly but can be leveraged as a pivot point for further attacks such as internal network scanning, accessing sensitive metadata services, or exploiting other internal vulnerabilities.

For European organizations using ChanCMS versions 3.1.0 through 3.1.2, this SSRF vulnerability poses a moderate risk. Successful exploitation could allow attackers to access internal network resources that are otherwise protected by perimeter defenses, potentially exposing sensitive internal services, databases, or administrative interfaces. This could lead to information disclosure or facilitate lateral movement within the network. Public-facing ChanCMS installations are particularly at risk, especially if the server hosts other critical services or has access to sensitive internal infrastructure. The medium CVSS score suggests that while the immediate impact is limited, chained attacks leveraging this SSRF could escalate the threat. European organizations in sectors with stringent data protection requirements (e.g., finance, healthcare, government) may face compliance risks if internal data is exposed. Additionally, the public disclosure of the exploit increases the urgency for timely patching to prevent opportunistic attacks.

1. Immediate upgrade of ChanCMS installations to version 3.1.3 or later, which contains the fix for this SSRF vulnerability. 2. Implement strict input validation and sanitization on the targetUrl parameter to restrict requests to only trusted domains or internal endpoints explicitly allowed. 3. Employ network-level controls such as egress filtering and firewall rules to limit the server's ability to make arbitrary outbound HTTP requests, especially to internal IP ranges and sensitive metadata services. 4. Monitor web server logs and application logs for unusual outbound request patterns or repeated access to the /cms/collect/getPages endpoint with suspicious parameters. 5. Use web application firewalls (WAFs) with rules tailored to detect and block SSRF attack patterns targeting ChanCMS. 6. Conduct internal network segmentation to minimize the impact of SSRF exploitation by isolating critical services from the CMS server. 7. Regularly review and update CMS components and dependencies to ensure timely application of security patches.