CVE-2026-79745 Missing authorization in mcphub

High 7.1 Published 31 Aug 2026 Updated 2 Sep 2026

Non-admin users can modify global prompt templates and resources, potentially injecting malicious content into other users' sessions.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-79745?

CVE-2026-79745 is a high-severity missing authorization vulnerability in samanhappy mcphub, published on 31 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-862

Which versions are affected by CVE-2026-79745?

How do I fix CVE-2026-79745?

No fix has been published for CVE-2026-79745 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-79745 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79745 exists.

Sources

Also known as GHSA-6cvf-cfch-4g7m.