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CVE-2026-31950

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

Published: Mar 27, 2026Updated: Mar 30, 2026 Sources: CVE List NVDCWE-284
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.2%
Top 89.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-284CWE-639

Affected Products

LibreChatdanny-avila
Mixed
Communications / messaging-chat
librechatlibrechat
Mixed
Communications / messaging-chat
danny-avilaindividual-devCommunicationsaka danny-avila/librechat, librechat
librechatoss-projectCommunications

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
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References

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

Timeline

Published
Mar 27, 2026
Last Updated
Mar 30, 2026

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