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CVE-2025-66451— LibreChat's Improper Input Validation in Prompt Creation API Enables Unauthorized Permission Changes

Quick assessment

Affected
danny-avila LibreChat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LibreChat是Danny Avila个人开发者的一个增强的 ChatGPT 克隆。 LibreChat 0.8.0及之前版本存在安全漏洞，该漏洞源于未充分验证JSON请求输入，可能导致非预期的提示修改。

AI Predicted 8.8 Difficulty: Easy EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-66451

Vulnerability Information
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Vulnerability Title
LibreChat's Improper Input Validation in Prompt Creation API Enables Unauthorized Permission Changes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
LibreChat 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreChat是Danny Avila个人开发者的一个增强的 ChatGPT 克隆。 LibreChat 0.8.0及之前版本存在安全漏洞，该漏洞源于未充分验证JSON请求输入，可能导致非预期的提示修改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
danny-avila LibreChat < 0.8.1 -

II. Public POCs for CVE-2025-66451

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III. Intelligence Information for CVE-2025-66451

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Patches & Fixes for CVE-2025-66451 (1)

Vendor Advisories for CVE-2025-66451 (1)

Same Patch Batch · danny-avila · 2025-12-11 · 3 CVEs total

CVE-2025-66450 LibreChat JSON Injection in Chat POST Allows Remote Resource Inclusion and PXSS via Image
CVE-2025-66452 LibreChat's lack of JSON parsing error handling can lead to XSS

IV. Related Vulnerabilities

Same product: LibreChat
Same vendor: danny-avila
Same weakness: CWE-20

V. Comments for CVE-2025-66451

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