CVE-2026-41427

{
  "id": "CVE-2026-41427",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-24T20:16:27.390",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5."
    },
    {
      "lang": "es",
      "value": "Better Auth es una biblioteca de autenticación y autorización para TypeScript. Antes de 1.6.5, la opción clientPrivileges documenta una acción de creación, pero los puntos finales de creación de clientes OAuth no invocaban el ’hook’ antes de persistir nuevos clientes. Las implementaciones que configuraron clientPrivileges para restringir el registro de clientes no estaban realmente restringidas - cualquier usuario autenticado podía acceder a los puntos finales de creación y registrar un cliente OAuth con URIs de redirección y metadatos elegidos por el atacante. Esta vulnerabilidad está corregida en 1.6.5."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "better-auth",
          "product": "better-auth",
          "versions": [
            {
              "version": ">= 1.4.8-beta.7, < 1.6.5",
              "status": "affected"
            },
            {
              "version": ">= 1.7.0-beta.0, <= 1.7.0-beta.1",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "better-auth",
          "product": "oauth-provider",
          "versions": [
            {
              "version": ">= 1.4.8-beta.7, < 1.6.5",
              "status": "affected"
            },
            {
              "version": ">= 1.7.0-beta.0, <= 1.7.0-beta.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "LOW",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-27T13:42:15.023332Z",
          "id": "CVE-2026-41427",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:better-auth:better-auth\\/oauth-provider:*:*:*:*:*:node.js:*:*",
              "versionStartIncluding": "1.4.9",
              "versionEndExcluding": "1.6.5",
              "matchCriteriaId": "CE35ECEB-5E33-41B9-B2D1-E45759AF936E"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:better-auth:better-auth\\/oauth-provider:1.4.8:-:*:*:*:node.js:*:*",
              "matchCriteriaId": "6DA5C22B-C161-46D4-945E-3041EFA2376C"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:better-auth:better-auth\\/oauth-provider:1.4.8:beta7:*:*:*:node.js:*:*",
              "matchCriteriaId": "823F67C9-1A4F-4491-B4F1-CE9BB49BA6EC"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:better-auth:better-auth\\/oauth-provider:1.7.0:beta0:*:*:*:node.js:*:*",
              "matchCriteriaId": "69DC1E8F-2C5D-4D63-A054-B26028655FD2"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6",
      "source": "[email protected]",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ]
    }
  ]
}