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CVE-2026-90474— MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass

Quick assessment

Affected
samanhappy mcphub
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

samanhappy MCPHub是samanhappy个人开发者开源的一个MCP服务器管理工具。 samanhappy MCPHub 1.0.32之前版本存在授权问题漏洞，该漏洞源于内嵌OAuth 2.0授权服务器默认禁用客户端身份验证且PKCE验证为可选，攻击者可通过拦截获取授权码，在未提供客户端密钥或PKCE验证器的情况下将其兑换为访问令牌，从而访问受害者账户及其权限。

CVSS 6.8 · Medium EPSS 0.55% · P46

Possible ATT&CK Techniques 1 AI

T1040 · Network Sniffing

Affected Version Matrix 1

VendorProduct Version RangeStatus
samanhappy mcphub < 1.0.32 affected
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I. Basic Information for CVE-2026-90474

Vulnerability Information
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Vulnerability Title
MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
MCPHub before 1.0.32 contains an authentication bypass vulnerability in its embedded OAuth 2.0 authorization server where client authentication is disabled by default and PKCE enforcement is optional. Attackers who obtain an authorization code through interception can redeem it for access tokens without providing a client secret or PKCE verifier, gaining access to victim accounts and their privileges.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
samanhappy MCPHub 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
samanhappy MCPHub是samanhappy个人开发者开源的一个MCP服务器管理工具。 samanhappy MCPHub 1.0.32之前版本存在授权问题漏洞，该漏洞源于内嵌OAuth 2.0授权服务器默认禁用客户端身份验证且PKCE验证为可选，攻击者可通过拦截获取授权码，在未提供客户端密钥或PKCE验证器的情况下将其兑换为访问令牌，从而访问受害者账户及其权限。
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
samanhappy mcphub 0 ~ 1.0.32 -

II. Public POCs for CVE-2026-90474

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-90474

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Patches & Fixes for CVE-2026-90474 (2)

Vendor Advisories for CVE-2026-90474 (2)

Vendor Pages for CVE-2026-90474 (1)

IV. Related Vulnerabilities

Same product: mcphub
Same vendor: samanhappy
Same weakness: CWE-287