CVE-2025-66452: LibreChat is a ChatGPT clone with additional features. In versions 0.8.0 and below, there is no handler for JSON…
CVE-2025-66452 · Severity: medium · CVSS 6.1 · Published 2025-12-11
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.
No. Junglewise Threat Intelligence has no report of CVE-2025-66452 being exploited in the wild.
How severe is CVE-2025-66452?
Medium severity, with a CVSS score of 6.1, published 11 December 2025.
Which products and versions are affected?
LibreChat. The advisory does not name versions.
Is there a fix for CVE-2025-66452?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-66452?
Check whether you run LibreChat. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.