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CVE-2025-66452— LibreChat's lack of JSON parsing error handling can lead to XSS

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及之前版本存在跨站脚本漏洞，该漏洞源于未处理JSON解析错误，可能导致跨站脚本攻击。

AI Predicted 4.3 Difficulty: Easy EPSS 0.22% · P11
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I. Basic Information for CVE-2025-66452

Vulnerability Information
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Vulnerability Title
LibreChat's lack of JSON parsing error handling can lead to XSS
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
LibreChat 跨站脚本漏洞
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及之前版本存在跨站脚本漏洞，该漏洞源于未处理JSON解析错误，可能导致跨站脚本攻击。
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-2025-66452

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III. Intelligence Information for CVE-2025-66452

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Vendor Advisories for CVE-2025-66452 (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-2025-66451 LibreChat's Improper Input Validation in Prompt Creation API Enables Unauthorized Permissi

IV. Related Vulnerabilities

Same product: LibreChat
Same vendor: danny-avila
Same weakness: CWE-79

V. Comments for CVE-2025-66452

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