Missing Authorization in LibreChat - CVE-2026-54029
Published: June 3, 2026
Vulnerability identifier: #VU133261
CSH Severity: Low
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54029
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to delete arbitrary messages.
The vulnerability exists due to improper access control in the DELETE /api/messages/:conversationId/:messageId endpoint when handling crafted delete requests. A remote user can supply a valid conversationId they own and a victim's messageId to delete arbitrary messages.
Successful exploitation requires knowledge of the target messageId, and deleted messages are permanently removed rather than soft-deleted.
Affected software
LibreChat
How to mitigate CVE-2026-54029
Install security update from vendor's website.
LibreChat - update to 0.8.4 rc1