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CVE-2026-31950— LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats

Quick assessment

Affected
danny-avila LibreChat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 5.3 · Medium EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
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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III. Intelligence Information for CVE-2026-31950

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Vendor Advisories for CVE-2026-31950 (1)

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
Same vendor: danny-avila
Same weakness: CWE-284

V. Comments for CVE-2026-31950

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