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CVE-2026-27836

Estado: AnalizadaAlta (7.5)—

phpMyFAQ is an open source FAQ web application. Prior to version 4.0.18, the WebAuthn prepare endpoint (`/api/webauthn/prepare`) creates new active user accounts without any authentication, CSRF protection, captcha, or configuration checks. This allows unauthenticated attackers to create unlimited user accounts even when registration is disabled. Version 4.0.18 fixes the issue.

CVSS

Probabilidad de explotación (EPSS)

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.

Vulnerabilidad en endpoint web de phpMyFAQ accesible sin autenticación (AV:N, PR:N, UI:N) que permite crear cuentas de usuario ilimitadas, otorgando acceso no autorizado (T1078) y creación de cuentas (T1136) incluso con registro deshabilitado (CWE-862: autorización insuficiente).

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

Privileged Account ManagementNetwork SegmentationMulti-factor AuthenticationApplication Developer GuidanceActive Directory ConfigurationVulnerability Scanning

Tecnologías afectadas (1)

Phpmyfaq — Phpmyfaq

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-27836",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-03T20:24:53.798510Z"
        }
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          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
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      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "thorsten",
          "product": "phpMyFAQ",
          "versions": [
            {
              "status": "affected",
              "version": "< 4.0.18"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-02-27T20:21:40.330",
  "references": [
    {
      "url": "https://github.com/thorsten/phpMyFAQ/commit/f2ab673f0668753cd0f7c7c8bc7fd2304dcf5cb1",
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        "Vendor Advisory"
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      "description": [
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    },
    {
      "lang": "es",
      "value": "phpMyFAQ es una aplicación web de preguntas frecuentes de código abierto. Antes de la versión 4.0.18, el endpoint de preparación de WebAuthn ('/API/webauthn/prepare') crea nuevas cuentas de usuario activas sin ninguna autenticación, protección CSRF, captcha o comprobaciones de configuración. Esto permite a atacantes no autenticados crear cuentas de usuario ilimitadas incluso cuando el registro está deshabilitado. La versión 4.0.18 corrige el problema."
    }
  ],
  "lastModified": "2026-06-17T10:27:46.023",
  "configurations": [
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        {
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