CVE-2026-54029
Last modified
CVE-2026-54029 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.15% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Librechat | Librechat | <= 0.8.3 |
References
- https://github.com/danny-avila/LibreChat/security/advisories/GHSA-8892-xj8q-59xcExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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