CVE-2026-79745 (GCVE-0-2026-79745)
Vulnerability from cvelistv5 – Published: 2026-08-31 17:56 – Updated: 2026-08-31 17:56
VLAI
EPSS
VEX
Title
MCPHub: Missing Authorization on Built-in Prompt & Resource CRUD (Unauthorized Tampering of Globally-Served Templates/Resources)
Summary
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.
Severity
7.1 (High)
CWE
- CWE-862 - Missing Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/samanhappy/mcphub/security/adv… | x_refsource_CONFIRM |
| https://github.com/samanhappy/mcphub/pull/1069 | x_refsource_MISC |
| https://github.com/samanhappy/mcphub/commit/6ba55… | x_refsource_MISC |
| https://github.com/samanhappy/mcphub/releases/tag… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| samanhappy | mcphub |
Affected:
< 1.0.32
|
guessed |
{
"containers": {
"cna": {
"affected": [
{
"product": "mcphub",
"vendor": "samanhappy",
"versions": [
{
"status": "affected",
"version": "\u003c 1.0.32"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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 \u2014 ahead of any connected MCP server \u2014 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\u0027 LLM sessions is a downstream consequence of that tampering. This issue has been patched in version 1.0.32."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "CWE-862: Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-31T17:56:17.622Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/samanhappy/mcphub/security/advisories/GHSA-6cvf-cfch-4g7m",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/samanhappy/mcphub/security/advisories/GHSA-6cvf-cfch-4g7m"
},
{
"name": "https://github.com/samanhappy/mcphub/pull/1069",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/samanhappy/mcphub/pull/1069"
},
{
"name": "https://github.com/samanhappy/mcphub/commit/6ba55ac63954a71506e61c088753251e2ff643cf",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/samanhappy/mcphub/commit/6ba55ac63954a71506e61c088753251e2ff643cf"
},
{
"name": "https://github.com/samanhappy/mcphub/releases/tag/v1.0.32",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/samanhappy/mcphub/releases/tag/v1.0.32"
}
],
"source": {
"advisory": "GHSA-6cvf-cfch-4g7m",
"discovery": "UNKNOWN"
},
"title": "MCPHub: Missing Authorization on Built-in Prompt \u0026 Resource CRUD (Unauthorized Tampering of Globally-Served Templates/Resources)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-79745",
"datePublished": "2026-08-31T17:56:17.622Z",
"dateReserved": "2026-08-25T14:08:18.108Z",
"dateUpdated": "2026-08-31T17:56:17.622Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-79745",
"date": "2026-09-01",
"epss": "0.00246",
"percentile": "0.15718"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-79745\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-31T18:17:19.910\",\"lastModified\":\"2026-08-31T18:17:19.910\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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 \u2014 ahead of any connected MCP server \u2014 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\u0027 LLM sessions is a downstream consequence of that tampering. This issue has been patched in version 1.0.32.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"samanhappy\",\"product\":\"mcphub\",\"versions\":[{\"version\":\"\u003c 1.0.32\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.8,\"impactScore\":4.2}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-862\"}]}],\"references\":[{\"url\":\"https://github.com/samanhappy/mcphub/commit/6ba55ac63954a71506e61c088753251e2ff643cf\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/samanhappy/mcphub/pull/1069\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/samanhappy/mcphub/releases/tag/v1.0.32\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/samanhappy/mcphub/security/advisories/GHSA-6cvf-cfch-4g7m\",\"source\":\"security-advisories@github.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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