CVE-2025-12421

{
  "id": "CVE-2025-12421",
  "sourceIdentifier": "[email protected]",
  "published": "2025-11-27T18:15:46.223",
  "lastModified": "2026-10-19T13:10:00.110",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled)."
    },
    {
      "lang": "es",
      "value": "Las versiones de Mattermost 11.0.x menor o igual que 11.0.2, 10.12.x menor o igual que 10.12.1, 10.11.x menor o igual que 10.11.4, 10.5.x menor o igual que 10.5.12 no verifican que el token utilizado durante el intercambio de código se origine del mismo flujo de autenticación, lo que permite a un usuario autenticado realizar una toma de control de cuenta a través de una dirección de correo electrónico especialmente diseñada, utilizada al cambiar métodos de autenticación y enviar una solicitud al endpoint /users/login/sso/code-exchange. La vulnerabilidad requiere que ExperimentalEnableAuthenticationTransfer esté habilitado (predeterminado: habilitado) y que RequireEmailVerification esté deshabilitado (predeterminado: deshabilitado)."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Mattermost",
          "product": "Mattermost",
          "defaultStatus": "unaffected",
          "versions": [
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              "version": "11.0.0",
              "lessThanOrEqual": "11.0.2",
              "versionType": "semver",
              "status": "affected"
            },
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              "version": "10.12.0",
              "lessThanOrEqual": "10.12.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "10.11.0",
              "lessThanOrEqual": "10.11.4",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "10.5.0",
              "lessThanOrEqual": "10.5.12",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "11.1.0",
              "status": "unaffected"
            },
            {
              "version": "11.0.3",
              "status": "unaffected"
            },
            {
              "version": "10.12.2",
              "status": "unaffected"
            },
            {
              "version": "10.11.5",
              "status": "unaffected"
            },
            {
              "version": "10.5.13",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-12-02T04:55:57.705451Z",
          "id": "CVE-2025-12421",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
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    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-303"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
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              "vulnerable": true,
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  "references": [
    {
      "url": "https://mattermost.com/security-updates",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}