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CVE-2026-39885

Agentfront Frontmcp server-side request forgery (SSRF)

7.5 HIGHPublic exploitEPSS 0.42%
  1. Published8 Apr 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Agentfront @frontmcp/adapters< 1.0.4
Agentfront Frontmcp< 1.0.4
Agentfront @frontmcp/sdk< 1.0.4
Frontmcp Mcp-from-openapi< 2.3.0

Remediation

Fixed in
Agentfront @frontmcp/adapters≥ 1.0.4
Agentfront Frontmcp≥ 1.0.4
Agentfront @frontmcp/sdk≥ 1.0.4
Frontmcp Mcp-from-openapi≥ 2.3.0

References

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Frequently asked

Is CVE-2026-39885 being actively exploited?

CVE-2026-39885 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-39885?

CVE-2026-39885 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-39885?

Affected products include Agentfront @frontmcp/adapters, Agentfront Frontmcp, Agentfront @frontmcp/sdk, Frontmcp Mcp-from-openapi.

How do I fix CVE-2026-39885?

Upgrade affected software to a fixed version, for example Agentfront @frontmcp/adapters 1.0.4, Agentfront Frontmcp 1.0.4, Agentfront @frontmcp/sdk 1.0.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.