linlinjava litemall JSON Web Token JwtHelper.java hard-coded credentials

A vulnerability was determined in linlinjava litemall up to 1.8.0. Affected by this issue is some unknown functionality of the file litemall-wx-api/src/main/java/org/linlinjava/litemall/wx/util/JwtHelper.java of the component JSON Web Token Handler. The manipulation of the argument SECRET with the input X-Litemall-Token leads to hard-coded credentials. The attack may be launched remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used.