CVE-2026-54027 Details
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.
A vulnerability in LibreChat versions prior to 0.8.4-rc1 allows authenticated users to upload files to any agent's tool resources without proper authorization checks. The issue arises in the POST /api/files/images endpoint, which lacks verification of ownership or edit permissions for the target agent. This oversight enables attackers to exploit the image upload route as a bypass to the existing file upload authorization, potentially leading to unauthorized modifications of agent resources.
Users should update to LibreChat version 0.8.4-rc1 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5 | CISA-ADP | ExploitVendor Advisory |
| https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5 | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| librechat librechat | <= 0.8.3 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 26, 2026 | Initial Analysis | [email protected] |
| Jun 26, 2026 | CVE Modified | CISA-ADP |
| Jun 25, 2026 | New CVE Received | [email protected] |