CVE-2025-66451: librechat Input Validation Flaw

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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Weakness Type (CWE)

CWE-20 Improper Input Validation

CWE-915 CWE-915

Affected Products

Vendor	Product	Versions
librechat	librechat	< 0.8.1

References

Advisories & Patches

https://github.com/danny-avila/LibreChat/commit/01413eea3d3c1454d32ca9704fa9640407839737 https://github.com/danny-avila/LibreChat/security/advisories/GHSA-vpqq-5qr4-655h

Exploits

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-vpqq-5qr4-655h

Frequently Asked Questions

What is CVE-2025-66451? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-66451? +

CVE-2025-66451 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-66451? +

CVE-2025-66451 affects products from librechat, specifically: librechat. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66451? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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