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.
MCPHub 1.0.32 之前的版本中存在一个认证绕过漏洞，位于其内置的 OAuth 2.0 授权服务器中。在该服务器中，客户端身份验证默认处于禁用状态，而 PKCE 强制要求是可选的。攻击者通过拦截获取授权码后，可以在不提供客户端密钥或 PKCE 验证器的情况下，将授权码兑换为访问令牌，从而获得对受害者账户及其权限的访问权。
Possible ATT&CK Techniques 1 AI
T1040 · Network SniffingAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
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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Patches & Fixes for CVE-2026-90474 (2)
Vendor Advisories for CVE-2026-90474 (2)
-
-
🔗 MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass | Advisories | VulnCheck third-party-advisory
Vendor Pages for CVE-2026-90474 (1)
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🔗 Release v1.0.32 · samanhappy/mcphub · GitHub release-notes
IV. Related Vulnerabilities
Same product: mcphub
-
CVE-2026-79743
MCPHub: Path Traversal via Malicious MCPB Manifest Name -
CVE-2026-79744
MCPHub: Missing Authorization on `PUT /api/system-config` Le -
CVE-2026-79745
MCPHub: Missing Authorization on Built-in Prompt & Resource -
CVE-2026-79746
MCPHub: Server-scoped bearer key gains access to an entire g -
CVE-2026-79747
MCPHub vulnerable to SSRF: a non-admin user can make mcphub
Same vendor: samanhappy
-
CVE-2026-79743
MCPHub: Path Traversal via Malicious MCPB Manifest Name -
CVE-2026-79744
MCPHub: Missing Authorization on `PUT /api/system-config` Le -
CVE-2026-79745
MCPHub: Missing Authorization on Built-in Prompt & Resource -
CVE-2026-79746
MCPHub: Server-scoped bearer key gains access to an entire g -
CVE-2026-79747
MCPHub vulnerable to SSRF: a non-admin user can make mcphub
Same weakness: CWE-287
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CVE-2026-88007
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V. Comments for CVE-2026-90474
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