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CVE-2026-54027— LibreChat: Image Upload Route Bypasses Agent Permission Check — Incomplete Fix for File Upload Authorization

CVSS 6.5 · Medium EPSS 0.19% · P9

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-54027

Vulnerability Information
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Vulnerability Title
LibreChat: Image Upload Route Bypasses Agent Permission Check — Incomplete Fix for File Upload Authorization
Source: NVD (National Vulnerability Database)
Vulnerability Description
LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/files/images endpoint allows any authenticated user to upload files into any agent's tool_resources (e.g., context, execute_code) without verifying ownership or EDIT permission on the target agent. A permission check was added to the POST /api/files route in a previous patch, but the image upload route was never updated with the same check. An attacker can simply use the image endpoint instead of the file endpoint to bypass the authorization entirely. This vulnerability is fixed in 0.8.4-rc1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
danny-avilaLibreChat < 0.8.4-rc1 -

II. Public POCs for CVE-2026-54027

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III. Intelligence Information for CVE-2026-54027

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Other References for CVE-2026-54027 (1)

Same Patch Batch · danny-avila · 2026-06-25 · 9 CVEs total

CVE-2026-540308.0 HIGHLibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
CVE-2026-540337.7 HIGHLibreChat: SSRF via User-Provided Custom Endpoint baseURL — no private IP validation on us
CVE-2026-540376.5 MEDIUMLibreChat: Incomplete Fix for CVE-2025-7105 — /api/convos/duplicate Lacks Rate Limiting Ap
CVE-2026-540246.5 MEDIUMLibreChat: Incomplete Fix for CVE-2024-11171 — Conversation Import Multer Instance Missing
CVE-2026-540405.9 MEDIUMLibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass
CVE-2026-540255.4 MEDIUMLibreChat: Stored XSS via unescaped image alt text in markdown artifact preview
CVE-2026-540365.3 MEDIUMLibreChat: 2FA Re-enrollment Allows Full Account 2FA Takeover Without OTP Verification
CVE-2026-540295.3 MEDIUMLibreChat: IDOR in Message Deletion — Incomplete Fix for CVE-2024-41703 Leaves deleteMessa

IV. Related Vulnerabilities

Same product: LibreChat
Same vendor: danny-avila
Same weakness: CWE-862

V. Comments for CVE-2026-54027

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