CVE-2025-10410 is a server-side request forgery (SSRF) vulnerability identified in SourceCodester Link Status Checker version 1.0. The vulnerability resides in the index.php file, specifically in the handling of the 'proxy' argument. An attacker can manipulate this parameter to cause the server to make unintended HTTP requests to arbitrary URLs. SSRF vulnerabilities allow attackers to abuse the server as a proxy to access internal or external resources that may otherwise be inaccessible. This can lead to information disclosure, internal network reconnaissance, or further exploitation of internal services. The vulnerability can be exploited remotely without requiring user interaction or authentication, increasing its risk profile. The CVSS 4.0 base score is 5.3 (medium severity), reflecting that the attack vector is network-based with low attack complexity and no privileges or user interaction needed. The impact on confidentiality, integrity, and availability is limited but present, as the attacker can coerce the server into making requests that may expose sensitive data or trigger unintended actions. No patches or mitigations have been publicly disclosed yet, and no known exploits are currently observed in the wild. However, the public disclosure of the vulnerability increases the risk of exploitation attempts.

For European organizations using SourceCodester Link Status Checker 1.0, this SSRF vulnerability poses a moderate risk. Attackers could leverage the vulnerability to access internal systems behind firewalls, potentially exposing sensitive internal services, configuration data, or private endpoints. This could facilitate lateral movement within the network or data exfiltration. In sectors with strict data protection regulations such as GDPR, unauthorized access to internal resources could lead to compliance violations and reputational damage. Additionally, if the Link Status Checker is integrated into critical infrastructure monitoring or web management workflows, exploitation could disrupt operations or provide attackers with footholds for further attacks. The medium severity score suggests that while the vulnerability is not critical, it should be addressed promptly to prevent escalation. European organizations with internet-facing deployments of this product are particularly at risk, especially if the application is used in environments with sensitive internal networks or critical services.

1. Immediate mitigation should include restricting access to the vulnerable application to trusted networks or VPNs to reduce exposure. 2. Implement input validation and sanitization on the 'proxy' parameter to ensure only legitimate and safe URLs can be requested, or disable the proxy functionality if not required. 3. Employ network-level controls such as egress filtering and firewall rules to prevent the server from making unauthorized outbound requests to internal or sensitive IP ranges. 4. Monitor application logs for unusual outbound request patterns that may indicate exploitation attempts. 5. If possible, upgrade to a patched version once available or apply vendor-provided patches promptly. 6. Conduct a thorough security review of the application and related infrastructure to identify and remediate any additional SSRF or similar vulnerabilities. 7. Consider deploying Web Application Firewalls (WAFs) with rules to detect and block SSRF attack patterns targeting the proxy parameter.