Input validation error in LibreChat - CVE-2025-66450
Published: April 27, 2026
Vulnerability identifier: #VU128109
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-66450
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LibreChat
Affected software:
LibreChat
LibreChat
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper input validation in the chat POST handler when processing the user-supplied iconURL parameter. A remote user can send a specially crafted request to disclose sensitive information.
User interaction is required because another user must view a shared chat containing the malicious resource reference.
How to mitigate CVE-2025-66450
Install security update from vendor's website.