Language: JavaScript
Label: vulnerable
CWE: CWE-78 \u2014 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Code:
`+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},less:function(It){this.unput(this.match.slice(It))},pastInput:function(){var It=this.matched.substr(0,this.matched.length-this.match.length);return(It.length>20?"...":"")+It.substr(-20).replace(/\n/g,"")},upcomingInput:function(){var It=this.match;return It.length<20&&(It+=this._input.substr(0,20-It.length)),(It.substr(0,20)+(It.length>20?"...":"")).replace(/\n/g,"")},showPosition:function(){var It=this.pastInput(),Pt=new Array(It.length+1).join("-");return It+this.upcomingInput()+`