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CVE-2025-8848 PoC — HTML Injection in Accept-Language Header in danny-avila/librechat

Source
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-8848.yaml
Associated Vulnerability
Title:HTML Injection in Accept-Language Header in danny-avila/librechat (CVE-2025-8848)
Description:A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML injection via the Accept-Language header. When a logged-in user sends an HTTP GET request with a crafted Accept-Language header, arbitrary HTML can be injected into the <html lang=""> tag of the response. This can lead to potential security risks such as cross-site scripting (XSS) attacks.
Description
danny-avila/librechat 0.7.9 contains a stored XSS caused by improper sanitization of the Accept-Language header, letting logged-in users inject arbitrary HTML into the html lang= tag, exploit requires user to be logged in.
File Snapshot

 id: CVE-2025-8848

info:
  name: LibreChat <= 0.7.9 - HTML Injection via Accept-Language Header
  au

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