CVE-2026-54029

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the DELETE /api/messages/:conversationId/:messageId endpoint allows any authenticated user to delete any other user's messages. The validateMessageReq middleware only validates that the conversationId belongs to the requesting user, but the handler calls deleteMessages({ messageId }) using only the messageId as the MongoDB filter — without adding a user constraint. An attacker provides their own valid conversationId (to pass validation) and the victim's messageId (to target deletion), resulting in permanent, irrecoverable message deletion. This vulnerability is fixed in 0.8.4-rc1.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-8892-xj8q-59xc	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*

History

25 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) LibreChat es un clon mejorado de ChatGPT que soporta múltiples proveedores de IA. Antes de la versión 0.8.4-rc1, el endpoint DELETE /API/messages/:conversationId/:messageId permite a cualquier usuario autenticado eliminar los mensajes de cualquier otro usuario. El middleware validateMessageReq solo valida que el conversationId pertenezca al usuario solicitante, pero el gestor llama a deleteMessages({ messageId }) utilizando solo el messageId como filtro de MongoDB - sin añadir una restricción de usuario. Un atacante proporciona su propio conversationId válido (para pasar la validación) y el messageId de la víctima (para dirigir la eliminación), lo que resulta en la eliminación permanente e irrecuperable del mensaje. Esta vulnerabilidad se corrige en la versión 0.8.4-rc1.

Information

Published : 2026-06-25 17:16

Updated : 2026-10-25 22:10

NVD link : CVE-2026-54029

Mitre link : CVE-2026-54029

CVE.ORG link : CVE-2026-54029

JSON object : View

Products Affected

librechat

librechat

CWE

CWE-862

Missing Authorization

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