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CVE-2026-113603

Estado: RecibidaMedia (6.9)—
Gravedad6.9Media · CVSS 4.0
Probabilidad de explotación—en los próximos 30 días
Explotación activaNono figura en el catálogo de CISA
Exploit públicoNo conocidosin código público localizado

La extensión del servidor SIWX de x402 presente en @x402/extensions desde la 2.3.1 hasta la 2.28.0, en x402 de PyPI desde la 2.11.0 hasta la 2.25.0, y en el módulo de Go desde la 2.16.0 hasta la 2.28.0, contiene una vulnerabilidad de elusión de autorización que permite a los clientes que pagan desbloquear rutas no pagadas al proporcionar una URL de PaymentPayload.resource que no coincide. Los atacantes pueden pagar por la ruta protegida con SIWX más barata y, al mismo tiempo, establecer resource.url en una ruta más cara; después, pueden acceder repetidamente a ella usando únicamente una cabecera SIGN-IN-WITH-X, sin realizar ningún pago adicional.

Traducción automática del texto original de NVD (en inglés).

CVSS

Puntuación base
6.9
Versión
4.0
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Probabilidad de explotación (EPSS)

FIRST aún no ha puntuado esta CVE (habitual en CVEs muy recientes o rechazadas).

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector AV:N/PR:N/UI:N (explotación remota sin autenticación) y CWE-639: el bypass de autorización permite acceder a rutas no pagadas; no hay impacto ATT&CK explícito en el texto.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (2)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

X402 — X402AIX402 — X402 ExtensionsAI

CWE

Referencias

Mostrar las 6 referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-113603",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "disclosure@vulncheck.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 3.9
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "disclosure@vulncheck.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6.9,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "disclosure@vulncheck.com",
      "affectedData": [
        {
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "product": "@x402/extensions",
          "versions": [
            {
              "status": "affected",
              "version": "2.3.1",
              "versionType": "semver",
              "lessThanOrEqual": "2.28.0"
            }
          ],
          "packageURL": "pkg:npm/%40x402/extensions",
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "product": "x402",
          "versions": [
            {
              "status": "affected",
              "version": "2.11.0",
              "versionType": "semver",
              "lessThanOrEqual": "2.25.0"
            }
          ],
          "packageURL": "pkg:pypi/x402",
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "product": "github.com/x402-foundation/x402/go/v2",
          "versions": [
            {
              "status": "affected",
              "version": "2.16.0",
              "versionType": "semver",
              "lessThanOrEqual": "2.28.0"
            }
          ],
          "packageURL": "pkg:golang/github.com/x402-foundation/x402/go/v2",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-10-20T16:17:10.087",
  "references": [
    {
      "url": "https://github.com/x402-foundation/x402/blob/go/v2.28.0/go/extensions/signinwithx/server.go",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/x402-foundation/x402/blob/npm-@x402/extensions@v2.28.0/typescript/packages/extensions/src/sign-in-with-x/hooks.ts",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/x402-foundation/x402/blob/pypi-x402@v2.25.0/python/x402/extensions/sign_in_with_x/hooks.py",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/x402-foundation/x402/issues/3838",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/x402-foundation/x402/pull/3840",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://www.vulncheck.com/advisories/x402-x402-extensions-2.3.1-through-2.28.0-siwx-payment-bypass-via-paymentpayload-resource",
      "source": "disclosure@vulncheck.com"
    }
  ],
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "disclosure@vulncheck.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The x402 SIWX server extension in @x402/extensions 2.3.1 through 2.28.0, x402 PyPI 2.11.0 through 2.25.0, and Go module 2.16.0 through 2.28.0 contains an authorization bypass vulnerability that allows paying clients to unlock unpaid routes by supplying a mismatched PaymentPayload.resource URL. Attackers can pay for the cheapest SIWX-protected route while setting resource.url to an expensive route, then repeatedly access it using only a SIGN-IN-WITH-X header without further payment."
    }
  ],
  "lastModified": "2026-10-20T16:17:10.087",
  "sourceIdentifier": "disclosure@vulncheck.com"
}