{"cve":{"cve_id":"CVE-2026-39885","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00319,"epss_percentile":0.23517,"epss_as_of":"2026-06-23","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.","published_at":"2026-04-08T20:34:20.538000Z","last_modified_at":null,"cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-918"],"nvd_references":["https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj","https://github.com/agentfront/frontmcp/releases/tag/v1.0.4"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:30:09.771414Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"agentfront","vendor_name":"agentfront","product_slug":"frontmcp","product_name":"frontmcp","version_start":"< 1.0.4","version_start_inclusive":true,"version_end":"< 1.0.4","version_end_inclusive":true,"cpe23_uri":"cve5:agentfront:frontmcp:< 1.0.4:< 1.0.4"},{"vendor_slug":"frontmcp","vendor_name":"@frontmcp","product_slug":"adapters","product_name":"adapters","version_start":"< 1.0.4","version_start_inclusive":true,"version_end":"< 1.0.4","version_end_inclusive":true,"cpe23_uri":"cve5:frontmcp:adapters:< 1.0.4:< 1.0.4"},{"vendor_slug":"frontmcp","vendor_name":"@frontmcp","product_slug":"mcp-from-openapi","product_name":"mcp-from-openapi","version_start":"<  2.3.0","version_start_inclusive":true,"version_end":"<  2.3.0","version_end_inclusive":true,"cpe23_uri":"cve5:frontmcp:mcp-from-openapi:<  2.3.0:<  2.3.0"},{"vendor_slug":"frontmcp","vendor_name":"@frontmcp","product_slug":"sdk","product_name":"sdk","version_start":"< 1.0.4","version_start_inclusive":true,"version_end":"< 1.0.4","version_end_inclusive":true,"cpe23_uri":"cve5:frontmcp:sdk:< 1.0.4:< 1.0.4"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/agentfront/frontmcp/releases/tag/v1.0.4","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-04-08T20:34:20.538000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:53:39.415886Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:53:39.415886Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:53:39.415886Z","label":"CVSS score revised","source":"cvelistv5"}]}