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.
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Fixes

Solution

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Workaround

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History

Fri, 12 Dec 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 12 Dec 2025 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Librechat
Librechat librechat
Vendors & Products Librechat
Librechat librechat

Thu, 11 Dec 2025 23:00:00 +0000

Type Values Removed Values Added
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.
Title LibreChat's lack of JSON parsing error handling can lead to XSS
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 5.3, 'vector': '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-12-12T19:28:19.177Z

Reserved: 2025-12-01T18:44:35.639Z

Link: CVE-2025-66452

cve-icon Vulnrichment

Updated: 2025-12-12T19:28:16.184Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2025-12-11T23:15:50.880

Modified: 2025-12-12T15:17:31.973

Link: CVE-2025-66452

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-12T08:48:42Z

Weaknesses