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    CVE-2025-66452

    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.

    Published:Dec 11, 2025
    Last Modified:Dec 15, 2025
    EPS:Dec 11, 2025
    EPSS Score:0.00054
    CVSS Score:6.1

    Affected Products

    Vendor
    Librechat
    Product
    Librechat

    Exploits

    https://github.com/danny-avila/LibreChat/security/advisories/GHSA-q6c5-gvj5-c264

    Related CVEs

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    CVE-2026-32625 (CVSS 9.6) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. In versions up to and including 0.…
    CVE-2026-31942 (CVSS 7.1) — LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. In versions up to and including 0.…
    CVE-2026-34371 (CVSS 6.3) — LibreChat is a ChatGPT clone with additional features. Prior to 0.8.4, LibreChat trusts the name field returne…
    CVE-2026-31951 (CVSS 6.8) — LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created M…
    CVE-2026-31950 (CVSS 5.3) — LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE stream…
    CVE-2026-31945 (CVSS 7.7) — LibreChat is a ChatGPT clone with additional features. Versions 0.8.2-rc2 through 0.8.2 are vulnerable to a se…
    CVE-2026-31943 (CVSS 8.5) — LibreChat is a ChatGPT clone with additional features. Prior to version 0.8.3, `isPrivateIP()` in `packages/ap…
    CVE-2026-33265 (CVSS 6.3) — In LibreChat 0.8.1-rc2, a logged-in user obtains a JWT for both the LibreChat API and the RAG API.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High