« Volver al listado

CVE-2026-42849

Estado: AnalizadaCrítica (9.3)—

authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, due to the implementation of stages in the SFE (Simple Flow Executor) in order to make the interface more compatible with legacy browsers, it was possible to use an XSS exploit in the AutosubmitStage. This issue has been patched in versions 2025.12.5 and 2026.2.3.

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.

XSS en AutosubmitStage (CWE-79, UI:R, AV:N) → T1189 drive-by. Ejecución JavaScript en navegador (T1059.007) + potencial robo de sesiones/credenciales (T1078) en contexto de proveedor de identidad.

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

User TrainingRestrict Web-Based ContentApplication Developer GuidanceActive Directory ConfigurationUser Account ManagementPrivileged Account Management

Tecnologías afectadas (1)

Goauthentik — Authentik

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-42849",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-42849",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-03T19:04:51.712238Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 9.3,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.8,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "goauthentik",
          "product": "authentik",
          "versions": [
            {
              "status": "affected",
              "version": "< 2025.12.5"
            },
            {
              "status": "affected",
              "version": "< 2026.2.3"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-06-02T21:16:27.670",
  "references": [
    {
      "url": "https://github.com/goauthentik/authentik/security/advisories/GHSA-pgff-5mx8-fqj3",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, due to the implementation of stages in the SFE (Simple Flow Executor) in order to make the interface more compatible with legacy browsers, it was possible to use an XSS exploit in the AutosubmitStage. This issue has been patched in versions 2025.12.5 and 2026.2.3."
    },
    {
      "lang": "es",
      "value": "authentik es un proveedor de identidad de código abierto. Antes de las versiones 2025.12.5 y 2026.2.3, debido a la implementación de etapas en el SFE (Simple Flow Executor) para hacer la interfaz más compatible con navegadores heredados, era posible utilizar un exploit XSS en la AutosubmitStage. Este problema ha sido parcheado en las versiones 2025.12.5 y 2026.2.3."
    }
  ],
  "lastModified": "2026-07-22T19:10:00.120",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3FF08370-A757-48DC-A907-C7FDC71EEF81",
              "versionEndExcluding": "2025.12.5"
            },
            {
              "criteria": "cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7EFE13DB-BF6F-40C0-8A24-AFD9618C040A",
              "versionEndExcluding": "2026.2.3",
              "versionStartIncluding": "2026.2.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}