CVE-2026-31950— LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats
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I. Basic Information for CVE-2026-31950
Vulnerability Information
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Vulnerability Title
LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
访问控制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
LibreChat 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreChat是LibreChat开源的一个免费、高度可定制的统一 AI 对话平台，能够在一个界面中聚合并运行来自任意厂商的大模型。 LibreChat 0.8.2-rc2至0.8.2-rc3版本存在访问控制错误漏洞，该漏洞源于SSE流式端点/api/agents/chat/stream/:streamId未验证请求用户是否拥有该流，可能导致任何经过身份验证的用户在获取或猜测到有效流ID后订阅并读取其他用户的实时聊天内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| danny-avila | LibreChat | >= 0.8.2-rc2, < 0.8.2 | - |
II. Public POCs for CVE-2026-31950
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|---|
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Same Patch Batch · danny-avila · 2026-03-27 · 4 CVEs total
| CVE-2026-31943 | 8.5 HIGH | LibreChat has SSRF protection bypass via IPv4-mapped IPv6 normalization in isPrivateIP |
| CVE-2026-31945 | 7.7 HIGH | LibreChat Server-Side Request Forgery using DNS resolution |
| CVE-2026-31951 | 6.8 MEDIUM | LibreChat's MCP Server Header Injection Enables OAuth Token Theft |
IV. Related Vulnerabilities
Same product: LibreChat
- CVE-2026-34371
LibreChat Affected by Arbitrary File Write via `execute_code - CVE-2026-31951
LibreChat's MCP Server Header Injection Enables OAuth Token - CVE-2026-31945
LibreChat Server-Side Request Forgery using DNS resolution - CVE-2026-31943
LibreChat has SSRF protection bypass via IPv4-mapped IPv6 no - CVE-2026-33265
LibreChat 安全漏洞
Same vendor: danny-avila
- CVE-2026-34371
LibreChat Affected by Arbitrary File Write via `execute_code - CVE-2026-31951
LibreChat's MCP Server Header Injection Enables OAuth Token - CVE-2026-31945
LibreChat Server-Side Request Forgery using DNS resolution - CVE-2026-31943
LibreChat has SSRF protection bypass via IPv4-mapped IPv6 no - CVE-2025-41258
LibreChat RAG API Authentication Bypass
Same weakness: CWE-284
- CVE-2026-8233
Dotouch XproUPF access control - CVE-2026-42569
phpvms: /importer authorization bypass causing full database - CVE-2026-42205
Avo: Broken Access Control: Unauthorized Execution of Arbitr - CVE-2026-41487
Langfuse: Improper role-based-access control in Langfuse LLM - CVE-2026-42278
UltraDAG: Smart Account Spending Policy Bypass via Pockets
V. Comments for CVE-2026-31950
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