提交 #994199: Privoce vocechat <=0.9.121 Improper Neutralization of Alternate XSS Syntax

The welcome query parameter on the widget.html page is not sanitized or encoded before being written directly into a dangerous DOM sink (e.g., innerHTML) by client-side JavaScript, resulting in a DOM-based Cross-Site Scripting (XSS) vulnerability. An attacker can craft a malicious link that, when clicked by a victim, executes arbitrary JavaScript in the victim's browser session. This can be used to exfiltrate sensitive client-side data such as localStorage, sessionStorage, or accessible cookies, as well as to perform session hijacking, phishing, or malicious redirects.

Proof of Concept: http://localhost:3001/widget.html?welcome=<img src=x onerror="alert(JSON.stringify(localStorage))">

Trigger condition: Victim visits a link containing the malicious welcome parameter.

Root cause: User-controllable input from the URL is not HTML-escaped or sanitized before being inserted into a DOM-rendering sink on the client side.

• 来源: ⚠️ https://github.com/H1ck1y/Vulnerabilities/blob/main/Vocechat_DomXss.md
• 用户: dyihan (UID 101533)
• 提交: 2026-09-22 15時21分 (1 月前)
• 管理: 2026-10-24 16時00分 (1 month later)
• 状态: 已接受
• VulDB条目: 426123 [Privoce Vocechat 直到 0.9.121 Query Parameter widget.html welcome 跨网站脚本]
• 积分: 20