CVE-2026-31950 (GCVE-0-2026-31950)

Vulnerability from cvelistv5 – Published: 2026-03-27 19:25 – Updated: 2026-03-27 19:55
VLAI
Title
LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats
Summary
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.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-27 19:55 UTC
CWE
  • CWE-284 - Improper Access Control
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7965 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
danny-avila LibreChat Affected: >= 0.8.2-rc2, < 0.8.2
guessed Create a notification for this product.
Show details on NVD website
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