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

29 Jun 2026, 15:36

Type	Values Removed	Values Added
CPE		cpe:2.3:a:librechat:librechat::::::::
First Time		Librechat librechat Librechat
References	~~() https://github.com/danny-avila/LibreChat/security/advisories/GHSA-8892-xj8q-59xc -~~	() https://github.com/danny-avila/LibreChat/security/advisories/GHSA-8892-xj8q-59xc - Exploit, Vendor Advisory

25 Jun 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-25 17:16

Updated : 2026-06-29 15:36

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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