CVE-2025-66451: Librechat

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

LibreChat is a ChatGPT clone with additional features. In versions 0.8.0 and below, when creating prompts, JSON requests are sent to define and modify the prompts via PATCH endpoint for prompt groups (/api/prompts/groups/:groupId). However, the request bodies are not sufficiently validated for proper input, enabling users to modify prompts in a way that was not intended as part of the front end system. The patchPromptGroup function passes req.body directly to updatePromptGroup() without filtering sensitive fields. This issue is fixed in version 0.8.1.

Affected products

• Librechat Librechat: before 0.8.1 (fixed in 0.8.1)

Published 2025-12-11. Last modified 2026-10-07.