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CVE-2026-82454

Estado: AplazadaCrítica (9.3)—

The Omnivore API (packages/api) before the fix in commit abf53d6 contains an authentication bypass in Apple sign-in token verification. The decodeAppleToken function extracted the 'alg' field from the attacker-supplied JWT header and passed it as the sole allowed algorithm to jwt.verify(). Using jsonwebtoken v8 (which does not validate key/algorithm compatibility), an attacker can set alg=HS256 and sign a forged token using Apple's publicly available RSA public key as the HMAC secret, bypassing signature verification and impersonating any Apple-linked account.

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.

Vulnerabilidad de verificación de JWT en Apple sign-in: ataque de algoritmo confuso (CWE-347) permite forjar tokens sin validar compatibilidad clave-algoritmo, obteniendo acceso como usuario autenticado (T1078.001) sin credenciales legítimas, afectando auth0 jsonwebtoken.

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

Vulnerability ScanningPrivileged Account ManagementPassword PoliciesNetwork SegmentationMulti-factor AuthenticationLimit Access to Resource Over Network

Tecnologías afectadas (2)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Auth0 — JsonwebtokenAIOmnivore — OmnivoreAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-82454",
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          "id": "CVE-2026-82454",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
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            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-08-31T16:34:03.423024Z"
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    "cvssMetricV31": [
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          "integrityImpact": "HIGH",
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        "impactScore": 5.2,
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      }
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    "cvssMetricV40": [
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        "cvssData": {
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          "valueDensity": "NOT_DEFINED",
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          "versions": [
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  "published": "2026-08-29T14:16:38.480",
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      "url": "https://github.com/omnivore-app/omnivore/commit/abf53d6508755d3d22a994e28e370a9193ea977a",
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      "lang": "en",
      "value": "The Omnivore API (packages/api) before the fix in commit abf53d6 contains an authentication bypass in Apple sign-in token verification. The decodeAppleToken function extracted the 'alg' field from the attacker-supplied JWT header and passed it as the sole allowed algorithm to jwt.verify(). Using jsonwebtoken v8 (which does not validate key/algorithm compatibility), an attacker can set alg=HS256 and sign a forged token using Apple's publicly available RSA public key as the HMAC secret, bypassing signature verification and impersonating any Apple-linked account."
    }
  ],
  "lastModified": "2026-09-24T21:08:55.030",
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}