CVE-2025-66452
MEDIUM EPSS 7.9%
Published Dec 11, 20256mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 4.0
Published Dec 11, 2025 6mo ago
Last Modified Jun 17, 2026 2w ago
Description
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction P
Scope X
Threat Intelligence
EPSS Exploit Probability
7.9% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available
Weaknesses 1
CWE-79 Cross-site Scripting Injection
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| librechat | librechat | * | ≤0.8.0 |
References 1
- github.com https://github.com/danny-avila/LibreChat/security/advisories/GHSA-q6c5-gvj5-c264
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.