Vulnerability · Published Dec 11, 2025 · Assigned by GitHub_M
CVE-2025-66451LibreChat's Improper Input Validation in Prompt Creation API Enables Unauthorized Permission Changes
Medium 5.3
In plain English
A medium-severity improper input validation in LibreChat from danny-avila. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| danny-avila | LibreChat | < 0.8.1 |
Weakness: CWE-20, CWE-915 · 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