FKIE_CVE-2026-47201

Vulnerability from fkie_nvd - Published: 2026-06-02 21:16 - Updated: 2026-07-22 19:10
Severity
8.5 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.
References
security-advisories@github.comhttps://github.com/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3Mitigation, Vendor Advisory
Impacted products
Vendor Product Version
goauthentik authentik *
goauthentik authentik *
goauthentik authentik *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "authentik",
          "vendor": "goauthentik",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2025.12.5"
            },
            {
              "status": "affected",
              "version": "\u003c 2026.2.3"
            },
            {
              "status": "affected",
              "version": "\u003c 2026.5.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2248E771-C089-49F8-B370-D3E089534A60",
              "versionEndExcluding": "2025.12.6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2723A03F-6FA5-40D6-9D67-320CBC6538C4",
              "versionEndExcluding": "2026.2.4",
              "versionStartIncluding": "2026.2.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D092DE78-A8F3-4569-80F8-0289DF27CB2D",
              "versionEndExcluding": "2026.5.1",
              "versionStartIncluding": "2026.5.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik\u0027s SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1."
    },
    {
      "lang": "es",
      "value": "authentik es un proveedor de identidad de c\u00f3digo abierto. Antes de las versiones 2025.12.5, 2026.2.3 y 2026.5.1, el endpoint ACS de la fuente SAML de authentik es vulnerable a la envoltura de firma XML al validar respuestas SAML ascendentes. Un atacante con cualquier cuenta en el IdP ascendente puede reutilizar una aserci\u00f3n firmada v\u00e1lida para autenticarse como otro usuario federado. Este problema ha sido parcheado en las versiones 2025.12.5, 2026.2.3 y 2026.5.1."
    }
  ],
  "id": "CVE-2026-47201",
  "lastModified": "2026-07-22T19:10:00.120",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-47201",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-03T13:56:09.745826Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-02T21:16:27.940",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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