TI-2026-61501 Aliases CVE-2026-90474 GHSA-c47m-m826-fc8g

MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass

HIGH 68CWE-287Published 2026-09-12 · Updated 2026-09-24

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: Present
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00553 46th percentileScored 2026-11-07

Fix Fixed mcphub (samanhappy): 1.0.32

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
samanhappy	mcphub	before 1.0.32	1.0.32	Patch available	CNA

mcphub Vendorsamanhappy Affected before 1.0.32 Fixed in 1.0.32 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:mcphubx:mcphub::::::::	—	—	samanhappy

cpe:2.3:a:mcphubx:mcphub:*:*:*:*:*:*:*:* Versions — — ·samanhappy

Remediation

Fix · CNA mcphub (samanhappy) Fixed in 1.0.32

Timeline

2026-10-02 Threatist record created from CVE-2026-90474
2026-10-03 Alias added: GHSA-c47m-m826-fc8g

References

Patch 1

fix(security): enforce OAuth client auth and S256-only PKCE policy

Advisory 1

GitHub Security Advisory (GHSA-3m7m-37xf-xp9x)

Other 2

TI-2026-55229 MCPHub: Authenticated non-admin user achieves RCE via POST /api/servers (missing authorization on stdio command/args) CVSS 3.1CRITICAL 9.9
TI-2026-55225 MCPHub: Missing Authorization on `PUT /api/system-config` Lets Any Non-Admin Rewrite Global Security Configuration CVSS 3.1HIGH 8.8
TI-2026-55224 MCPHub: Path Traversal via Malicious MCPB Manifest Name CVSS 4.0MEDIUM 6.9
TI-2025-10335 samanhappy MCPHub sseService.ts handleSseConnectionfunction improper authentication CVSS 4.0MEDIUM 6.9
TI-2026-55230 MCPHub: SSRF Guard Bypass via IPv6 Transition Addresses in URL Validation CVSS 4.0HIGH 7.6
TI-2026-55231 Authorization bypass in samanhappy mcphub CVSS 3.1HIGH 7.7

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences