Improper Output Neutralization for Logs in RAG API - CVE-2026-4276
Published: March 17, 2026
Vulnerability identifier: #VU124047
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-4276
CWE-ID: CWE-117
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LibreChat
Affected software:
RAG API
RAG API
Detailed vulnerability description
The vulnerability allows a remote user to manipulate or forge log entries.
The vulnerability exists due to improper input validation in the log generation mechanism when processing user-supplied input in POST requests. A remote authenticated user can send a specially crafted request containing CRLF sequences in the file_id parameter to inject arbitrary log entries.
This vulnerability compromises the integrity of audit logs, potentially enabling obfuscation of malicious activity or downstream attacks such as cross-site scripting (XSS) if logs are displayed in a web-based console without proper sanitization.
How to mitigate CVE-2026-4276
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.