CVE-2026-54029: CWE-862: Missing Authorization in danny-avila LibreChat
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.
AI Analysis
Technical Summary
The vulnerability in LibreChat involves missing authorization checks on the message deletion endpoint. Although the middleware validates that the conversationId belongs to the requesting user, the deletion handler only filters by messageId without confirming that the message belongs to the user. This allows an authenticated attacker to delete any user's messages by supplying a valid conversationId they own and the victim's messageId. The vulnerability is addressed in version 0.8.4-rc1.
Potential Impact
An authenticated attacker can permanently delete messages of other users, causing loss of data integrity and denial of access to those messages. There is no confidentiality or availability impact reported, but message integrity is compromised.
Mitigation Recommendations
Upgrade LibreChat to version 0.8.4-rc1 or later, where the authorization check for message deletion has been properly implemented. Patch status is not explicitly stated but the vulnerability is fixed in 0.8.4-rc1. Until upgrading, restrict access to the vulnerable endpoint or monitor usage closely.
CVE-2026-54029: CWE-862: Missing Authorization in danny-avila LibreChat
Description
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 v3.1
Score 5.3medium
Affected software
pkg:github/danny-avila/LibreChatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in LibreChat involves missing authorization checks on the message deletion endpoint. Although the middleware validates that the conversationId belongs to the requesting user, the deletion handler only filters by messageId without confirming that the message belongs to the user. This allows an authenticated attacker to delete any user's messages by supplying a valid conversationId they own and the victim's messageId. The vulnerability is addressed in version 0.8.4-rc1.
Potential Impact
An authenticated attacker can permanently delete messages of other users, causing loss of data integrity and denial of access to those messages. There is no confidentiality or availability impact reported, but message integrity is compromised.
Mitigation Recommendations
Upgrade LibreChat to version 0.8.4-rc1 or later, where the authorization check for message deletion has been properly implemented. Patch status is not explicitly stated but the vulnerability is fixed in 0.8.4-rc1. Until upgrading, restrict access to the vulnerable endpoint or monitor usage closely.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-11T16:57:50.018Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3d5b504853345fc1337286
Added to database: 06/25/2026, 16:46:08 UTC
Last enriched: 06/25/2026, 17:02:23 UTC
Last updated: 06/26/2026, 00:42:45 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.