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CVE-2026-79745

MCPHub: Missing Authorization on Built-in Prompt & Resource CRUD (Unauthorized Tampering of Globally-Served Templates/Resources)

HIGH
7.1
CVSS Score
Published: August 31, 2026 at 05:56 PM UTC
Updated: September 8, 2026 at 09:19 PM UTC
1 product affected across 1 vendorMCPHub

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Severity
HIGH7.1
Exploit prediction
EPSS 0.4%
SSVC
PoC

Description

MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 1.0.32, the built-in prompt and resource controllers perform no role checking. The mutating POST/PUT /api/prompts* and POST/PUT /api/resources* routes are attached to the authenticated router with no admin gate, and the handlers never read req.user. The DAO singletons they write are consulted first — ahead of any connected MCP server — for every session in handleGetPromptRequest / handleReadResourceRequest. A non-admin can therefore create, overwrite, and shadow global prompt templates and resources that all other users are served. The scored impact is the unauthorized integrity violation (creation/tampering/shadowing of globally-served records); stored prompt injection into other users' LLM sessions is a downstream consequence of that tampering. This issue has been patched in version 1.0.32.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MCPHub· Samanhappy
60%
v < 1.0.32
Affected range stops below 1.0.32, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/samanhappy/mcphub/security/advisories/GHSA-6cvf-cfch-4g7m
x_refsource_MISC
Source: cverecord
https://github.com/samanhappy/mcphub/pull/1069
x_refsource_MISC
Source: cverecord
https://github.com/samanhappy/mcphub/commit/6ba55ac63954a71506e61c088753251e2ff643cf
x_refsource_MISC
Source: cverecord
https://github.com/samanhappy/mcphub/releases/tag/v1.0.32

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
LOW
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-862

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