Vulnerability ID: HTB22343
Reference: http://www.htbridge.ch/advisory/ip_address_spoofing_in_e107.html
Product: e107 Website System
Vendor: e107
Vulnerable Version: 0.7.19 and Probably Prior Versions
Vendor Notification: 05 April 2010 
Vulnerability Type: Application Logic Error
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Low 
Credit: High-Tech Bridge SA (http://www.htbridge.ch/) 

Vulnerability Details:
An attacker can spoof his IP address in the system logs. Attacker can alter the X-Forwarded-For field and system will log this value as real. IP-bases filtering systems can be bypassed, fake or local IPs may be logged instead of the real. Vulnerability is critical for IP-based authentications.

Attacker can use browser to exploit this vulnerability. The following PoC is available: 

X-Forwarded-For: 1.2.3.4