CVE-2026-49336

{
  "id": "CVE-2026-49336",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-19T19:16:36.430",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "@microsoft/kiota-http-fetchlibrary provides TypeScript libraries for Kiota-generated API clients. In versions 1.0.0-preview.97 through 1.0.0-preview.101, `@microsoft/kiota-http-fetchlibrary`'s `RedirectHandler` is documented as stripping `Authorization` and `Cookie` from cross-origin redirect targets, but the default `scrubSensitiveHeaders` callback in `RedirectHandlerOptions` uses case-sensitive property deletion (`delete headers.Authorization`, `delete headers.Cookie`) on a headers object that `FetchRequestAdapter.getRequestFromRequestInformation` has already lower-cased. The delete therefore targets keys that do not exist, the scrub is a no-op, and any Bearer token or Cookie attached by a kiota-generated SDK is forwarded to an attacker-controlled host across a 30x redirect. This is reachable in the default middleware chain (`MiddlewareFactory.getDefaultMiddlewares`) with no custom configuration, and applies to every kiota-generated TypeScript SDK that uses `BaseBearerTokenAuthenticationProvider` or any other authentication provider that sets the `Authorization` request header. Version 1.0.0-preview.102 patches the issue."
    },
    {
      "lang": "es",
      "value": "@microsoft/kiota-http-fetchlibrary proporciona bibliotecas TypeScript para clientes API generados por Kiota. En las versiones 1.0.0-preview.97 a 1.0.0-preview.101, el ’RedirectHandler’ de ’@microsoft/kiota-http-fetchlibrary’ está documentado como que elimina ’Authorization’ y ’Cookie’ de los destinos de redirección de origen cruzado, pero la devolución de llamada predeterminada ’scrubSensitiveHeaders’ en ’RedirectHandlerOptions’ utiliza la eliminación de propiedades que distingue entre mayúsculas y minúsculas (’delete headers.Authorization’, ’delete headers.Cookie’) en un objeto de encabezados que ’FetchRequestAdapter.getRequestFromRequestInformation’ ya ha convertido a minúsculas. Por lo tanto, la eliminación apunta a claves que no existen, la limpieza es una operación nula, y cualquier token Bearer o cookie adjuntado por un SDK generado por Kiota se reenvía a un host controlado por el atacante a través de una redirección 30x. Esto es accesible en la cadena de middleware predeterminada (’MiddlewareFactory.getDefaultMiddlewares’) sin configuración personalizada, y se aplica a cada SDK TypeScript generado por Kiota que utiliza ’BaseBearerTokenAuthenticationProvider’ o cualquier otro proveedor de autenticación que establece el encabezado de solicitud ’Authorization’. La versión 1.0.0-preview.102 corrige el problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "microsoft",
          "product": "kiota-typescript",
          "versions": [
            {
              "version": ">= 1.0.0-preview.97, < 1.0.0-preview.102",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-22T15:05:06.323889Z",
          "id": "CVE-2026-49336",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-178"
        },
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/microsoft/kiota-typescript/commit/09f8bd9b34d68bf412a9b78f6ca7e7961ef14974",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/microsoft/kiota-typescript/security/advisories/GHSA-396q-4vc8-28x9",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/microsoft/kiota-typescript/security/advisories/GHSA-396q-4vc8-28x9",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}