CVE-2026-31950
LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-284 |
| Vendor | danny-avila |
| Product | librechat |
| Published | Mar 27, 2026 |
| Last Updated | Mar 27, 2026 |
Stay Ahead of the Next One
Get instant alerts for danny-avila librechat
Be the first to know when new medium vulnerabilities affecting danny-avila librechat are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
danny-avila / LibreChat
>= 0.8.2-rc2, < 0.8.2