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CVE-2018-5133

Status: ModifiedMedium (6.5)—

If the "app.support.baseURL" preference is changed by a malicious local program to contain HTML and script content, this content is not sanitized. It will be executed if a user loads "chrome://browser/content/preferences/in-content/preferences.xul" directly in a tab and executes a search. This stored preference is also executed whenever an EME video player plugin displays a CDM-disabled message as a notification message. This vulnerability affects Firefox < 59.

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 (2)

Canonical — Ubuntu LinuxMozilla — Firefox

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2018-5133",
  "cveTags": [],
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
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        "impactScore": 2.9,
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          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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          "product": "Firefox",
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  "published": "2018-06-11T21:29:14.250",
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      "tags": [
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          "value": "CWE-200"
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      "lang": "en",
      "value": "If the \"app.support.baseURL\" preference is changed by a malicious local program to contain HTML and script content, this content is not sanitized. It will be executed if a user loads \"chrome://browser/content/preferences/in-content/preferences.xul\" directly in a tab and executes a search. This stored preference is also executed whenever an EME video player plugin displays a CDM-disabled message as a notification message. This vulnerability affects Firefox < 59."
    },
    {
      "lang": "es",
      "value": "Si un programa local malicioso cambia la preferencia \"app.support.baseURL\" para que contenga contenido HTML y script, este contenido no se sanea. Se ejecutará si un usuario carga \"chrome://navegador/content/preferences/in-content/preferences.xul\" directamente en una pestaña y ejecuta una búsqueda. Esta preferencia almacenada también se ejecuta siempre que un plugin del reproductor de vídeo de EME muestre un mensaje CDM deshabilitado como mensaje de notificación. Esta vulnerabilidad afecta a las versiones anteriores a la 59 de Firefox."
    }
  ],
  "lastModified": "2026-06-17T01:59:41.120",
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