CVE-2026-32625Public exploitNetwork attack vector

Authenticated secret exfiltration via MCP URL expansion

Published Jun 2, 2026 · Updated Jun 2, 2026

Information disclosure in LibreChat 0.8.3 and earlier allows remote authenticated users to exfiltrate server secrets via MCP URLs. The MCP user-input schema in packages/data-provider/src/mcp.ts applies extractEnvVariable to untrusted SSE, HTTP, and WebSocket URLs, replacing ${VAR} tokens with process.env values before MCPServerInspector connects to the resolved endpoint. Any registered user account is sufficient, and the resulting request can expose encryption keys, JWT signing material, and database credentials to an attacker-controlled server.

CVSS severity9.6
Critical
EPSS probability2.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in LibreChat 0.8.3 and earlier allows remote authenticated users to exfiltrate server secrets via MCP URLs. The MCP user-input schema in packages/data-provider/src/mcp.ts applies extractEnvVariable to untrusted SSE, HTTP, and WebSocket URLs, replacing ${VAR} tokens with process.env values before MCPServerInspector connects to the resolved endpoint. Any registered user account is sufficient, and the resulting request can expose encryption keys, JWT signing material, and database credentials to an attacker-controlled server.

The record

CVE
CVE-2026-32625
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Danny Avila
Product
LibreChat
Classifications
CWE-200, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.8.4-rc1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Danny Avila · LibreChatversion=< 0.8.4-rc1

Published CVSS scores

9.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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