CVE-2025-8848

HTML Injection in Accept-Language Header in danny-avila/librechat

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

danny-avila · danny-avila/librechat

CVSS v3.1 NVD

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS v3.0 HUNTR

4.8 MEDIUMCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS

0.45% chance of exploitation in the next 30 days, 38th percentile

Nuclei

medium · CWE-79

Published

2025-10-22

Updated

2025-10-30

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-8848.yaml

Security advisories

• https://huntr.com/bounties/a05ebc1f-882a-4adc-b178-d3cefa4b730e

References

• CVE Record
• NVD entry