CVE-2026-39885
7.5 · HIGHOverview
CVE-2026-39885 is a high-severity vulnerability affecting agentfront \@frontmcp\/adapters. It was published on April 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from agentfront. Update \@frontmcp\/adapters to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| agentfront | \@frontmcp\/adapters | >= 0, < 1.0.4 | Affected |
| agentfront | \@frontmcp\/sdk | >= 0, < 1.0.4 | Affected |
| agentfront | frontmcp | >= 0, < 1.0.4 | Affected |
| frontmcp | mcp-from-openapi | >= 0, < 2.3.0 | Affected |
Frequently Asked Questions
What is CVE-2026-39885?
CVE-2026-39885 is a high-severity vulnerability affecting agentfront \@frontmcp\/adapters. It was published on April 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-39885?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-39885?
Check the references section for vendor advisories and patches from agentfront. Update \@frontmcp\/adapters to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-39885?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-39885 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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