CVE-2025-66452

MEDIUM

librechat < 0.8.0 - Cross-Site Scripting via JSON Parsing Error Handling

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 6.1
EPSS 0.0018
EPSS Percentile 7.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (1)
librechat/librechat < 0.8.0
Published Dec 11, 2025
Tracked Since Feb 18, 2026