utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-101059",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-09-27T17:02:40.181Z",
    "dateReserved": "2026-09-27T16:38:56.428Z",
    "datePublished": "2026-09-27T17:02:40.181Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-09-27T17:02:40.181Z"
      },
      "datePublic": "2026-06-14T00:00:00.000Z",
      "title": "utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass",
      "descriptions": [
        {
          "lang": "en",
          "value": "utcp-http before 1.1.4 fails to validate the OAuth2 tokenUrl field from remote OpenAPI specifications, allowing attackers to redirect credential submission to arbitrary endpoints. When a victim registers an attacker-controlled OpenAPI spec and invokes a generated OAuth2-protected tool, the library POSTs the victim's client_id and client_secret to the attacker-supplied token endpoint without URL validation."
        }
      ],
      "affected": [
        {
          "vendor": "universal-tool-calling-protocol",
          "product": "python-utcp",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "1.1.4"
            },
            {
              "version": "1.1.4",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Server-Side Request Forgery (SSRF)",
              "cweId": "CWE-918",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34",
          "name": "GitHub Security Advisory (GHSA-8cp3-qxj6-px34)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/utcp-http-before-1.1.4-oauth2-tokenurl-trust-boundary-bypass",
          "name": "VulnCheck Advisory: utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "REQUIRED",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "EQSTLab",
          "type": "reporter"
        },
        {
          "lang": "en",
          "value": "232-323",
          "type": "analyst"
        }
      ]
    }
  }
}