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CVE-2023-48228

Estado: ModificadaCrítica (9.8)—

authentik is an open-source identity provider. When initialising a oauth2 flow with a `code_challenge` and `code_method` (thus requesting PKCE), the single sign-on provider (authentik) must check if there is a matching and existing `code_verifier` during the token step. Prior to versions 2023.10.4 and 2023.8.5, authentik checks if the contents of `code_verifier` is matching only when it is provided. When it is left out completely, authentik simply accepts the token request with out it; even when the flow was started with a `code_challenge`. authentik 2023.8.5 and 2023.10.4 fix this 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).

Tecnologías afectadas (1)

Goauthentik — Authentik

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-48228",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "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
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "goauthentik",
          "product": "authentik",
          "versions": [
            {
              "status": "affected",
              "version": "< 2023.10.4"
            },
            {
              "status": "affected",
              "version": "< 2023.8.5"
            }
          ]
        }
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  ],
  "published": "2023-11-21T21:15:08.477",
  "references": [
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      "url": "https://github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225",
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    {
      "url": "https://github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225",
      "tags": [
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      "tags": [
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      "tags": [
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "authentik is an open-source identity provider. When initialising a oauth2 flow with a `code_challenge` and `code_method` (thus requesting PKCE), the single sign-on provider (authentik) must check if there is a matching and existing `code_verifier` during the token step. Prior to versions 2023.10.4 and 2023.8.5, authentik checks if the contents of `code_verifier` is matching only when it is provided. When it is left out completely, authentik simply accepts the token request with out it; even when the flow was started with a `code_challenge`. authentik 2023.8.5 and 2023.10.4 fix this issue."
    },
    {
      "lang": "es",
      "value": "authentik es un proveedor de identidad de código abierto. Al inicializar un flujo oauth2 con un `code_challenge` y un `code_method` (solicitando así PKCE), el proveedor de inicio de sesión único (authentik) debe verificar si hay un `code_verifier` coincidente y existente durante el paso del token. Antes de las versiones 2023.10.4 y 2023.8.5, authentik verifica si el contenido de `code_verifier` coincide solo cuando se proporciona. Cuando se omite por completo, authentik simplemente acepta la solicitud del token sin él; incluso cuando el flujo se inició con un \"code_challenge\". authentik 2023.8.5 y 2023.10.4 solucionan este problema."
    }
  ],
  "lastModified": "2026-06-17T06:33:47.157",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EDAD4E86-B0E7-4863-B8B4-D3B85DF1F9B3",
              "versionEndExcluding": "2023.8.5"
            },
            {
              "criteria": "cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "94DFCEE9-DE60-4890-8F11-D2EFDB0565D5",
              "versionEndExcluding": "2023.10.4",
              "versionStartIncluding": "2023.10.0"
            }
          ],
          "operator": "OR"
        }
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  "sourceIdentifier": "security-advisories@github.com"
}