LiveHelperChat 4.61 - Stored Cross Site Scripting (XSS) via Telegram Bot Username

# Exploit Title: LiveHelperChat 4.61 - Stored Cross Site Scripting (XSS)
via Telegram Bot Username
# Date: 09/06/2025
# Exploit Author: Manojkumar J (TheWhiteEvil)
# Linkedin: https://www.linkedin.com/in/manojkumar-j-7ba35b202/
# Vendor Homepage: https://github.com/LiveHelperChat/livehelperchat/
# Software Link:
https://github.com/LiveHelperChat/livehelperchat/
# Version: <=4.61
# Patched Version: 4.61
# Category: Web Application
# Tested on: Mac OS Sequoia 15.5, Firefox
# CVE : CVE-2025-51396
# Exploit link: https://github.com/Thewhiteevil/CVE-2025-51396

A stored cross-site scripting (XSS) vulnerability in Live Helper Chat
version ≤ 4.61 allows attackers to execute arbitrary JavaScript by
injecting a crafted payload into the Telegram Bot Username parameter. This
payload is stored and later executed when an admin or higher-privileged
user views or edits the Telegram Bot Username.


## Reproduction Steps:

1. Log in as an operator user in Live Helper Chat.
2. Navigate to `Settings > Live Help Configuration > Telegram Bot`.
3. In the **Bot Username** field, enter the following payload:
```
   "><img src="x" onerror="prompt(1);">
```
4. Save the settings.
5. Revisit the Telegram configuration panel and — the payload will execute.