CVE-2025-66452

LibreChat is a ChatGPT clone with additional features. In versions 0.8.0 and below, there is no handler for JSON parsing errors; SyntaxError from express.json() includes user input in the error message, which gets reflected in responses. User input (including HTML/JavaScript) can be exposed in error responses, creating an XSS risk if Content-Type isn't strictly enforced. This issue does not have a fix at the time of publication.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-q6c5-gvj5-c264	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*

History

15 Dec 2025, 17:35

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.1
References	~~() https://github.com/danny-avila/LibreChat/security/advisories/GHSA-q6c5-gvj5-c264 -~~	() https://github.com/danny-avila/LibreChat/security/advisories/GHSA-q6c5-gvj5-c264 - Exploit, Vendor Advisory
First Time		Librechat Librechat librechat
CPE		cpe:2.3:a:librechat:librechat::::::::

11 Dec 2025, 23:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-12-11 23:15

Updated : 2025-12-15 17:35

NVD link : CVE-2025-66452

Mitre link : CVE-2025-66452

CVE.ORG link : CVE-2025-66452

JSON object : View

Products Affected

librechat

librechat

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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