CVE-2025-66452CWE-79cross-site-scripting

CVE-2025-66452

Medium · published December 12, 2025

CVSS v3.1
6.1
EPSS
0%
Percentile
11.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00216 · 11.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2025-12-12T04:15Z
Affected products (1)
ProductVersionsFixed in
librechat/librechat≤ 0.8.0—
References (1)
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-q6c5-gvj5-c264 · [email protected]
EPSS history
Timeline
  • 11 DEC 22:52Z
    LibreChat's lack of JSON parsing error handling can lead to XSS
    cvelistv5