CVE-2026-31950: Librechat

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

Published 2026-03-27. Last modified 2026-06-17.