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CVE-2026-93394

Estado: AnalizadaMedia (6.3)—

A flaw in libmongoc's SCRAM authentication implementation caused the client to continue the authentication handshake and transmit the client proof even when a nonce mismatch was detected in the server's first message. An unauthorized party with a man-in-the-middle position could exploit this by injecting a crafted server-first-message containing a controlled salt and low iteration count, then capturing the resulting client proof to perform offline password cracking. This vulnerability is mitigated by TLS, which is standard in production deployments.

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.

MITM en SCRAM: inyecta nonce falso + salt débil para capturar proof de cliente y crackear contraseña offline. CWE-303 (captura de autenticación) sin mitigación TLS.

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

Update SoftwareApplication Developer GuidanceUser TrainingThreat Intelligence ProgramPassword PoliciesNetwork Segmentation

Tecnologías afectadas (1)

Mongodb — C Driver

CWE

Referencias

JSON original (NVD)

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          "role": "CISA Coordinator",
          "options": [
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          "timestamp": "2026-09-18T14:27:52.100964Z"
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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      "affectedData": [
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  "published": "2026-09-17T21:17:56.307",
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      "tags": [
        "Permissions Required"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "value": "CWE-303"
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  "descriptions": [
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      "lang": "en",
      "value": "A flaw in libmongoc's SCRAM authentication implementation caused the client to continue the authentication handshake and transmit the client proof even when a nonce mismatch was detected in the server's first message. An unauthorized party with a man-in-the-middle position could exploit this by injecting a crafted server-first-message containing a controlled salt and low iteration count, then capturing the resulting client proof to perform offline password cracking. This vulnerability is mitigated by TLS, which is standard in production deployments."
    }
  ],
  "lastModified": "2026-09-25T20:33:17.027",
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