CVE-2026-31950
Last modified
CVE-2026-31950 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint `/api/agents/chat/stream/:streamId` does not verify that the requesting user owns the stream. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
Description
LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint `/api/agents/chat/stream/:streamId` does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID can subscribe and read another user's real-time chat content, including messages, AI responses, and tool invocations. Version 0.8.2 patches the issue.
Metrics
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Librechat | Librechat | 0.8.2 | Rc2 |
References
- https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f6rf-vm44-wh5gExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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