https://portal.febraban.org.br/Scripts/CustomValidation.js

1var CustomValidation = {};
2CustomValidation.Init = function () {
3    //CustomValidationCPF
4    $.validator.addMethod('customvalidationcpf', function (value, element, params) {
5        var cpf = value.replace(/[^0-9]/gi, ''); //Remove tudo que não for número
6        if (value.length == 0)
7            return true; //vazio
8        if (cpf.length != 11 || cpf == "00000000000" || cpf == "11111111111" || cpf == "22222222222" || cpf == "33333333333" || cpf == "44444444444" || cpf == "55555555555" || cpf == "66666666666" || cpf == "77777777777" || cpf == "88888888888" || cpf == "99999999999")
9            return false;
10        add = 0;
11        for (i = 0; i < 9; i++)
12            add += parseInt(cpf.charAt(i)) * (10 - i);
13        rev = 11 - (add % 11);
14        if (rev == 10 || rev == 11)
15            rev = 0;
16        if (rev != parseInt(cpf.charAt(9)))
17            return false;
18        add = 0;
19        for (i = 0; i < 10; i++)
20            add += parseInt(cpf.charAt(i)) * (11 - i);
21        rev = 11 - (add % 11);
22        if (rev == 10 || rev == 11)
23            rev = 0;
24        if (rev != parseInt(cpf.charAt(10)))
25            return false;
26        return true; //cpf válido
27    }, '');
28    $.validator.unobtrusive.adapters.add('customvalidationcpf', {}, function (options) {
29        options.rules['customvalidationcpf'] = true;
30        options.messages['customvalidationcpf'] = options.message;
31    });
32}
33//executa -- importante que isso seja feito antes do document.ready
34CustomValidation.Init();