CVE-2025-8848 Scanner

LibreChat is a communication platform used by various organizations for internal and external communication. It's commonly used by businesses to facilitate team collaboration and project management. The platform supports multiple language options and user-generated content. The software is user-friendly and offers customizable options to suit different organizational needs. Despite its benefits, it is crucial for administrators to keep the software updated to prevent exploitation. LibreChat provides a collaborative environment but must be secured against potential vulnerabilities.

The Cross-Site Scripting (XSS) vulnerability occurs when attackers inject malicious scripts into trusted websites. In the case of LibreChat, this vulnerability is found in versions <= 0.7.9 due to inadequate input sanitization of the Accept-Language header. This allows logged-in users to inject arbitrary HTML content. When exploited, this vulnerability could lead to compromise of user sessions and sensitive data. Effective input validation and regular updates are essential measures to mitigate XSS attacks.

The vulnerability lies in the handling of the Accept-Language header which allows insertion of arbitrary HTML into the html lang= tag. The vulnerability is due to improper sanitization of user input in the header. Attackers can execute arbitrary scripts in the context of the user's session. This could potentially lead to unauthorized access to sensitive information or activities. Affected users must be logged in for the exploit to work, highlighting the importance of secure session management.

If this vulnerability is exploited, attackers can perform actions such as session hijacking or data theft. Unauthorized scripts could be executed, which might affect the integrity and confidentiality of user information. Users could be redirected to malicious websites without their knowledge. Such exploitation can erode trust in the platform and damage the reputation of the hosting organization. Preventative action is essential to maintain user safety and application integrity.

REFERENCES

• https://nvd.nist.gov/vuln/detail/CVE-2025-8848
• https://huntr.com/bounties/a05ebc1f-882a-4adc-b178-d3cefa4b730e
• https://github.com/danny-avila/LibreChat