CVE-2026-54027: 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…

PriorityP343medium6.5CVSS 3.1

AVNACLPRLUINSUCNIHAN

EPSS

0.19%

8.7th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
danny-avila	librechat	< 0.8.4-rc1	0.8.4-rc1
librechat	librechat	<= 0.8.3	—

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