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6 vulnerabilities found for frontmcp by agentfront
CVE-2026-59973 (GCVE-0-2026-59973)
Vulnerability from nvd – Published: 2026-09-15 15:13 – Updated: 2026-09-16 16:06
VLAI
EPSS
VEX
Title
mcp-from-openapi: Bypass of OpenAPI external $ref SSRF fix in latest FrontMCP and mcp-from-openapi
Summary
FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). From mcp-from-openapi 2.3.0 until 2.5.0 and from frontmcp and @frontmcp/adapters 1.2.1 until 1.5.0, libs/adapters/src/openapi/openapi.adapter.ts loadOpenAPISpec() forwards untrusted OpenAPI url and spec inputs and loadOptions.refResolution to OpenAPIToolGenerator.fromURL() and OpenAPIToolGenerator.fromJSON(). The external $ref guard checks parsed hostname strings without resolving addresses, pinning validated addresses, revalidating redirect targets, or normalizing IPv4-mapped IPv6. An authenticated user who can import or configure an OpenAPI specification in a hosted or multi-user deployment can use DNS-to-loopback resolution, redirect-to-loopback behavior, or IPv4-mapped IPv6 loopback forms to cause backend-origin requests to internal services. This can expose internal administrative APIs, metadata-like services, and other private network endpoints. The practical impact is lower when only a trusted local administrator can configure OpenAPI specs, and disabling external reference protocols prevents the external $ref request. This issue is fixed in mcp-from-openapi 2.5.0 and frontmcp and @frontmcp/adapters 1.5.0.
Severity
8.5 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 16:06 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/agentfront/frontmcp/security/a… | x_refsource_CONFIRM |
| https://github.com/agentfront/frontmcp/pull/496 | x_refsource_MISC |
| https://github.com/agentfront/mcp-from-openapi/pull/7 | x_refsource_MISC |
| https://github.com/agentfront/frontmcp/commit/96a… | x_refsource_MISC |
| https://github.com/agentfront/mcp-from-openapi/co… | x_refsource_MISC |
| https://github.com/agentfront/frontmcp/releases/t… | x_refsource_MISC |
| https://github.com/agentfront/mcp-from-openapi/re… | x_refsource_MISC |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| agentfront | frontmcp |
Affected:
< 1.5.0
|
|
| agentfront | mcp-from-openapi |
Affected:
< 2.5.0
|
|
| @frontmcp | adapters |
Affected:
< 1.5.0
|
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}
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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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}
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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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}
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"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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CVE-2026-59973 (GCVE-0-2026-59973)
Vulnerability from cvelistv5 – Published: 2026-09-15 15:13 – Updated: 2026-09-16 16:06
VLAI
EPSS
VEX
Title
mcp-from-openapi: Bypass of OpenAPI external $ref SSRF fix in latest FrontMCP and mcp-from-openapi
Summary
FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). From mcp-from-openapi 2.3.0 until 2.5.0 and from frontmcp and @frontmcp/adapters 1.2.1 until 1.5.0, libs/adapters/src/openapi/openapi.adapter.ts loadOpenAPISpec() forwards untrusted OpenAPI url and spec inputs and loadOptions.refResolution to OpenAPIToolGenerator.fromURL() and OpenAPIToolGenerator.fromJSON(). The external $ref guard checks parsed hostname strings without resolving addresses, pinning validated addresses, revalidating redirect targets, or normalizing IPv4-mapped IPv6. An authenticated user who can import or configure an OpenAPI specification in a hosted or multi-user deployment can use DNS-to-loopback resolution, redirect-to-loopback behavior, or IPv4-mapped IPv6 loopback forms to cause backend-origin requests to internal services. This can expose internal administrative APIs, metadata-like services, and other private network endpoints. The practical impact is lower when only a trusted local administrator can configure OpenAPI specs, and disabling external reference protocols prevents the external $ref request. This issue is fixed in mcp-from-openapi 2.5.0 and frontmcp and @frontmcp/adapters 1.5.0.
Severity
8.5 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 16:06 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/agentfront/frontmcp/security/a… | x_refsource_CONFIRM |
| https://github.com/agentfront/frontmcp/pull/496 | x_refsource_MISC |
| https://github.com/agentfront/mcp-from-openapi/pull/7 | x_refsource_MISC |
| https://github.com/agentfront/frontmcp/commit/96a… | x_refsource_MISC |
| https://github.com/agentfront/mcp-from-openapi/co… | x_refsource_MISC |
| https://github.com/agentfront/frontmcp/releases/t… | x_refsource_MISC |
| https://github.com/agentfront/mcp-from-openapi/re… | x_refsource_MISC |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| agentfront | frontmcp |
Affected:
< 1.5.0
|
|
| agentfront | mcp-from-openapi |
Affected:
< 2.5.0
|
|
| @frontmcp | adapters |
Affected:
< 1.5.0
|
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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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