CVE-2026-31950

MEDIUM

LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats

Title source: cna

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.

References (1)

[X_Refsource_Confirm] https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f6rf-vm44-wh5g

Scores

CVSS v3 5.3

EPSS 0.0004

EPSS Percentile 11.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-284 CWE-639

Status published

Products (2)

danny-avila/LibreChat >= 0.8.2-rc2, < 0.8.2

librechat/librechat 0.8.2 rc2 (2 CPE variants)

Published Mar 27, 2026

Tracked Since Mar 29, 2026