IBM API Connect 5.0.0.0 through 5.0.8.10 is vulnerable to HTTP header injection caused by improper validation of input by the HOST headers. By sending a specially crafted HTTP request a remote attacker could exploit this vulnerability to inject HTTP HOST header which will allow the attacker to conduct various attacks against the vulnerable system including cross-site scripting cache poisoning or session hijacking. IBM X-Force ID: 187194.