🛡️ CVE-2026-54027 — librechat

🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-862 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability none.

Weakness class

CVE-2026-54027 is classified as CWE-862: Missing Authorization. No authorisation check is performed before carrying out a restricted action.

Affected software

CVE-2026-54027 is recorded against 1 package.

  • librechat (fixed in 0.8.3)

Timeline and source

Published on 25 June 2026 and last revised on 26 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
github.com

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE CWE-862
Public Exploit ⚠️ Yes
Source NVD
Published 2026-06-25
Updated 2026-08-11
Modified 2026-06-26
Fix URL N/A

Affected Packages

Software From version Fixed in
librechat — 0.8.3

Similar Threats

Exploit Protection

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