CVE-2025-15154 is a security vulnerability identified in PbootCMS, a content management system, affecting all versions up to 3.2.12. The flaw exists in the get_user_ip function located in core/function/handle.php, specifically within the Header Handler component. The vulnerability stems from the improper handling of the X-Forwarded-For HTTP header, which is intended to convey the originating IP address of a client connecting through a proxy or load balancer. In this case, the function trusts the X-Forwarded-For header without sufficient validation, allowing an attacker to supply a manipulated or spoofed IP address. This results in the use of a less trusted source for the client IP, which can undermine security controls relying on accurate IP identification. The attack vector is remote and requires no authentication or user interaction, making exploitation feasible over the network. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the network attack vector, low attack complexity, and no privileges or user interaction required. The impact primarily affects the integrity of IP-based mechanisms such as access control lists, logging accuracy, rate limiting, or geo-restrictions. There is no indication of direct confidentiality or availability impact. No official patches or mitigations are linked yet, and no known exploits have been observed in the wild, but public disclosure increases the risk of exploitation attempts.

The vulnerability can lead to attackers spoofing their IP address as perceived by the PbootCMS application, potentially bypassing IP-based access controls, evading rate limits, or corrupting logs and audit trails. This can facilitate further attacks such as brute force, unauthorized access, or masking malicious activity. Organizations relying on PbootCMS for web content delivery or management may experience reduced security posture and increased risk of targeted attacks. The integrity of security mechanisms that depend on accurate client IP identification is compromised, which can have cascading effects on incident detection and response. While the vulnerability does not directly expose sensitive data or cause denial of service, the indirect consequences can be significant, especially for high-value targets or environments with strict IP-based policies.

1. Immediately upgrade PbootCMS to a version that addresses this vulnerability once an official patch is released. 2. Until patched, implement server-side validation to sanitize and verify the X-Forwarded-For header, for example, by trusting only headers from known and controlled proxies or load balancers. 3. Configure web server or reverse proxy to overwrite or remove untrusted X-Forwarded-For headers before they reach the application. 4. Employ network-level controls such as firewall rules or WAF policies to detect and block suspicious header manipulations. 5. Review and adjust IP-based access controls and rate limiting to consider potential spoofing. 6. Enhance logging to capture both the original and proxied IP addresses for forensic analysis. 7. Monitor for unusual access patterns that may indicate exploitation attempts. 8. Educate development and operations teams about the risks of trusting client-supplied headers without validation.