High severity · published Aug 31, 2026
CVE-2026-79745
MCPHub: Missing Authorization on Built-in Prompt & Resource CRUD (Unauthorized Tampering of Globally-Served Templates/Resources)
7.1
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
mcphub · samanhappy
< 1.0.32 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-79745
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-79745
github.com
https://github.com/samanhappy/mcphub/commit/6ba55ac63954a71506e61c088753251e2ff643cf
github.com
https://github.com/samanhappy/mcphub/pull/1069
github.com
https://github.com/samanhappy/mcphub/releases/tag/v1.0.32
github.com
https://github.com/samanhappy/mcphub/security/advisories/GHSA-6cvf-cfch-4g7m
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