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CVE-2026-54030— LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow

Quick assessment

Affected
danny-avila LibreChat
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

danny-avila LibreChat是danny-avila个人开发者的 Danny Avila LibreChat 0.8.5之前版本存在输入验证错误漏洞，该漏洞源于MCP OAuth实现未验证资源参数是否与配置的MCP服务器URL匹配，可能导致恶意MCP服务器窃取预期用于合法服务器的访问令牌。

CVSS 8.0 · High EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1539 · Steal Web Session Cookie

Affected Version Matrix 1

VendorProduct Version RangeStatus
danny-avila LibreChat < 0.8.5 affected
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I. Basic Information for CVE-2026-54030

Vulnerability Information
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Vulnerability Title
LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
Source: CVE Program / CVE List V5
Vulnerability Description
LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata (RFC 9728) matches the configured MCP server URL, allowing a malicious MCP server to steal access tokens intended for a legitimate server. This vulnerability is fixed in 0.8.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Danny Avila LibreChat 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
danny-avila LibreChat是danny-avila个人开发者的 Danny Avila LibreChat 0.8.5之前版本存在输入验证错误漏洞，该漏洞源于MCP OAuth实现未验证资源参数是否与配置的MCP服务器URL匹配，可能导致恶意MCP服务器窃取预期用于合法服务器的访问令牌。
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 < 0.8.5 -

II. Public POCs for CVE-2026-54030

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10688 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-54030

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Vendor Advisories for CVE-2026-54030 (1)

Same Patch Batch · danny-avila · 2026-06-25 · 9 CVEs total

CVE-2026-54033 7.7 HIGH LibreChat: SSRF via User-Provided Custom Endpoint baseURL — no private IP validation on us
CVE-2026-54027 6.5 MEDIUM LibreChat: Image Upload Route Bypasses Agent Permission Check — Incomplete Fix for File Up
CVE-2026-54037 6.5 MEDIUM LibreChat: Incomplete Fix for CVE-2025-7105 — /api/convos/duplicate Lacks Rate Limiting Ap
CVE-2026-54024 6.5 MEDIUM LibreChat: Incomplete Fix for CVE-2024-11171 — Conversation Import Multer Instance Missing
CVE-2026-54040 5.9 MEDIUM LibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass
CVE-2026-54025 5.4 MEDIUM LibreChat: Stored XSS via unescaped image alt text in markdown artifact preview
CVE-2026-54036 5.3 MEDIUM LibreChat: 2FA Re-enrollment Allows Full Account 2FA Takeover Without OTP Verification
CVE-2026-54029 5.3 MEDIUM LibreChat: IDOR in Message Deletion — Incomplete Fix for CVE-2024-41703 Leaves deleteMessa

IV. Related Vulnerabilities

Same product: LibreChat
Same vendor: danny-avila
Same weakness: CWE-346

V. Comments for CVE-2026-54030

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