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4 vulnerabilities found for frontmcp by agentfront
CVE-2026-67531 (GCVE-0-2026-67531)
Vulnerability from nvd – Published: 2026-08-05 22:54 – Updated: 2026-08-06 18:44
VLAI
EPSS
VEX
Title
FrontMCP: CodeCall sandbox escape -> host RCE via live Zod schema exposure by getTool
Summary
FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 1.5.7, the sandboxed codecall:execute tool exposes live host Zod schema instances to the script via getTool(), and because Zod v4 defines _zod as a non-configurable, non-writable own property, the ECMAScript Proxy invariants force the security membrane to hand back the raw host object, letting a script reach _zod.constr.constructor (the host Function constructor) and execute arbitrary code in the server process. A single tools/call is sufficient to escape the sandbox and achieve remote code execution as the server user, exposing everything the process holds such as OAuth client secrets, JWT_SECRET, session keys, database credentials, and cloud instance metadata. Because the framework's DEFAULT_AUTH_OPTIONS is public mode, an unconfigured server serves this to unauthenticated callers, and on authenticated servers an indirect prompt injection in tool output or fetched content can trigger it without a human attackerThis issue is fixed in version 1.5.7.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 18:38 UTC
CWE
- CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/agentfront/frontmcp/security/a… | x_refsource_CONFIRM |
| https://github.com/agentfront/frontmcp/commit/209… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| agentfront | frontmcp |
Affected:
< 1.5.7
|
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CVE-2026-39885 (GCVE-0-2026-39885)
Vulnerability from nvd – Published: 2026-04-08 20:34 – Updated: 2026-04-09 16:16
VLAI
EPSS
VEX
Title
FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications
Summary
FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 2.3.0, the mcp-from-openapi library uses @apidevtools/json-schema-ref-parser to dereference $ref pointers in OpenAPI specifications without configuring any URL restrictions or custom resolvers. A malicious OpenAPI specification containing $ref values pointing to internal network addresses, cloud metadata endpoints, or local files will cause the library to fetch those resources during the initialize() call. This enables Server-Side Request Forgery (SSRF) and local file read attacks when processing untrusted OpenAPI specifications. This vulnerability is fixed in 2.3.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-09 14:53 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/agentfront/frontmcp/security/a… | x_refsource_CONFIRM |
| https://github.com/agentfront/frontmcp/releases/t… | x_refsource_MISC |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| agentfront | frontmcp |
Affected:
< 1.0.4
|
|
| @frontmcp | adapters |
Affected:
< 1.0.4
|
|
| @frontmcp | sdk |
Affected:
< 1.0.4
|
|
| frontmcp | mcp-from-openapi |
Affected:
< 2.3.0
|
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CVE-2026-67531 (GCVE-0-2026-67531)
Vulnerability from cvelistv5 – Published: 2026-08-05 22:54 – Updated: 2026-08-06 18:44
VLAI
EPSS
VEX
Title
FrontMCP: CodeCall sandbox escape -> host RCE via live Zod schema exposure by getTool
Summary
FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 1.5.7, the sandboxed codecall:execute tool exposes live host Zod schema instances to the script via getTool(), and because Zod v4 defines _zod as a non-configurable, non-writable own property, the ECMAScript Proxy invariants force the security membrane to hand back the raw host object, letting a script reach _zod.constr.constructor (the host Function constructor) and execute arbitrary code in the server process. A single tools/call is sufficient to escape the sandbox and achieve remote code execution as the server user, exposing everything the process holds such as OAuth client secrets, JWT_SECRET, session keys, database credentials, and cloud instance metadata. Because the framework's DEFAULT_AUTH_OPTIONS is public mode, an unconfigured server serves this to unauthenticated callers, and on authenticated servers an indirect prompt injection in tool output or fetched content can trigger it without a human attackerThis issue is fixed in version 1.5.7.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 18:38 UTC
CWE
- CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/agentfront/frontmcp/security/a… | x_refsource_CONFIRM |
| https://github.com/agentfront/frontmcp/commit/209… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| agentfront | frontmcp |
Affected:
< 1.5.7
|
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CVE-2026-39885 (GCVE-0-2026-39885)
Vulnerability from cvelistv5 – Published: 2026-04-08 20:34 – Updated: 2026-04-09 16:16
VLAI
EPSS
VEX
Title
FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications
Summary
FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 2.3.0, the mcp-from-openapi library uses @apidevtools/json-schema-ref-parser to dereference $ref pointers in OpenAPI specifications without configuring any URL restrictions or custom resolvers. A malicious OpenAPI specification containing $ref values pointing to internal network addresses, cloud metadata endpoints, or local files will cause the library to fetch those resources during the initialize() call. This enables Server-Side Request Forgery (SSRF) and local file read attacks when processing untrusted OpenAPI specifications. This vulnerability is fixed in 2.3.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-09 14:53 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/agentfront/frontmcp/security/a… | x_refsource_CONFIRM |
| https://github.com/agentfront/frontmcp/releases/t… | x_refsource_MISC |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| agentfront | frontmcp |
Affected:
< 1.0.4
|
|
| @frontmcp | adapters |
Affected:
< 1.0.4
|
|
| @frontmcp | sdk |
Affected:
< 1.0.4
|
|
| frontmcp | mcp-from-openapi |
Affected:
< 2.3.0
|
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{
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"vendor": "agentfront",
"versions": [
{
"status": "affected",
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},
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}
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}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-918",
"description": "CWE-918: Server-Side Request Forgery (SSRF)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-08T20:34:20.538Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj"
},
{
"name": "https://github.com/agentfront/frontmcp/releases/tag/v1.0.4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/agentfront/frontmcp/releases/tag/v1.0.4"
}
],
"source": {
"advisory": "GHSA-v6ph-xcq9-qxxj",
"discovery": "UNKNOWN"
},
"title": "FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-39885",
"datePublished": "2026-04-08T20:34:20.538Z",
"dateReserved": "2026-04-07T20:32:03.010Z",
"dateUpdated": "2026-04-09T16:16:59.067Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}