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CVE-2019-9812

Status: ModifiedCritical (9.3)—

Given a compromised sandboxed content process due to a separate vulnerability, it is possible to escape that sandbox by loading accounts.firefox.com in that process and forcing a log-in to a malicious Firefox Sync account. Preference settings that disable the sandbox are then synchronized to the local machine and the compromised browser would restart without the sandbox if a crash is triggered. This vulnerability affects Firefox ESR < 60.9, Firefox ESR < 68.1, and Firefox < 69.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Mozilla — Firefox

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2019-9812",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 5.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 4.9,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
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    "cvssMetricV31": [
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        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 5.8,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox ESR",
          "versions": [
            {
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              "version": "before 60.9"
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  "published": "2020-01-08T22:15:13.310",
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1538008",
      "tags": [
        "Permissions Required"
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      "source": "security@mozilla.org"
    },
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1538015",
      "tags": [
        "Permissions Required"
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2019-25/",
      "tags": [
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      "source": "security@mozilla.org"
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      "url": "https://www.mozilla.org/security/advisories/mfsa2019-26/",
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Given a compromised sandboxed content process due to a separate vulnerability, it is possible to escape that sandbox by loading accounts.firefox.com in that process and forcing a log-in to a malicious Firefox Sync account. Preference settings that disable the sandbox are then synchronized to the local machine and the compromised browser would restart without the sandbox if a crash is triggered. This vulnerability affects Firefox ESR < 60.9, Firefox ESR < 68.1, and Firefox < 69."
    },
    {
      "lang": "es",
      "value": "Dado un proceso de contenido comprometido dentro del sandbox debido a una vulnerabilidad separada, es posible escapar de ese sandbox cargando accounts.firefox.com en ese proceso y forzando un inicio de sesión en una cuenta de Firefox Sync maliciosa. La configuración de preferencias que deshabilita el sandbox es sincronizada con la máquina local y el navegador comprometido se reiniciará sin el sandbox si es activado un bloqueo. Esta vulnerabilidad afecta a Firefox ESR versiones anteriores a 60.9, Firefox ESR versiones anteriores a la versión 68.1 y Firefox versiones anteriores a la versión  69."
    }
  ],
  "lastModified": "2026-06-17T02:44:39.007",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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  "sourceIdentifier": "security@mozilla.org"
}