---
id: CVE-2025-8848
title: >-
  A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML
  injection via the Accept-Language header
summary: >-
  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 t…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-94
  - CWE-79
vendor: librechat
product: librechat
affected:
  - librechat = 0.7.9
published: '2025-10-22'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T11:10:00.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-8848'
references:
  - url: 'https://huntr.com/bounties/a05ebc1f-882a-4adc-b178-d3cefa4b730e'
    label: security@huntr.dev
tags:
  - nvd
  - exploit-available
epss: 0.00453
epssPercentile: 0.37301
exploits:
  nuclei:
    - CVE-2025-8848
  checkedAt: '2026-10-08T11:32:03.415Z'
exploitAvailable: true
ingestedAt: '2026-10-08T11:31:27.491Z'
---

## Overview

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.

## Affected

- `librechat = 0.7.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.