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CVE-2026-53518

Estado: AnalizadaAlta (7.6)—

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11.

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.

Requiere interacción del usuario (UI:P) y vector de red (AV:N). La condición de carrera en token endpoint permite minter múltiples tokens válidos con una sola autorización, escalando a autenticación fraudulenta. AV:N + UI:R → T1203.

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

Active Directory ConfigurationUser TrainingUser Account ManagementPrivileged Account ManagementPassword PoliciesMulti-factor Authentication

Tecnologías afectadas (2)

Better-auth — Better-auth/oauth-providerBetter-auth — Better Auth

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-53518",
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          "options": [
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          "version": "2.0.3",
          "timestamp": "2026-07-15T18:07:40.302581Z"
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  "published": "2026-07-15T18:16:48.240",
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      "tags": [
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      "tags": [
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-7w99-5wm4-3g79",
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        "Vendor Advisory"
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      ]
    }
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      "lang": "en",
      "value": "Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11."
    }
  ],
  "lastModified": "2026-07-21T16:03:12.347",
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