Search

Find a vulnerability

Search criteria ⓘ Use this form to refine search results.
Full-text search supports keyword queries with ranking and filtering.
You can combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by date instead of relevance.

    1 vulnerability by @frontmcp

    CVE-2026-39885 (GCVE-0-2026-39885)

    Vulnerability from cvelistv5 – Published: 2026-04-08 20:34 – Updated: 2026-04-09 16:16
    VLAI
    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)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-918 - Server-Side Request Forgery (SSRF)
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39885",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-09T14:53:12.471902Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-09T16:16:59.067Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "frontmcp",
          "vendor": "agentfront",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.0.4"
            }
          ]
        },
        {
          "product": "adapters",
          "vendor": "@frontmcp",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.0.4"
            }
          ]
        },
        {
          "product": "sdk",
          "vendor": "@frontmcp",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.0.4"
            }
          ]
        },
        {
          "product": "mcp-from-openapi",
          "vendor": "frontmcp",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c  2.3.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "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"
}