Unauthorized File Upload in LibreChat by Danny Avila
CVE-2026-54027

6.5MEDIUM

Key Information:

Vendor

Danny-avila

Status
Librechat
Vendor
CVE Published:
25 June 2026

What is CVE-2026-54027?

The vulnerability in LibreChat allows any authenticated user to upload files to any agent's tool_resources via the POST /api/files/images endpoint without proper ownership verification or EDIT permissions. Although a previous patch included a permission check for the POST /api/files route, this check was not extended to the image upload route, enabling attackers to bypass authorization controls easily. This issue has been addressed in version 0.8.4-rc1.

Affected Version(s)

LibreChat < 0.8.4-rc1

References

https://github.com/danny-avila/LibreChat/security/advisor...
x_refsource_CONFIRM

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.