CVE-2019-9854

Estado: ModificadaAlta (7.8)—

LibreOffice has a feature where documents can specify that pre-installed macros can be executed on various script events such as mouse-over, document-open etc. Access is intended to be restricted to scripts under the share/Scripts/python, user/Scripts/python sub-directories of the LibreOffice install. Protection was added, to address CVE-2019-9852, to avoid a directory traversal attack where scripts in arbitrary locations on the file system could be executed by employing a URL encoding attack to defeat the path verification step.

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However this protection could be bypassed by taking advantage of a flaw in how LibreOffice assembled the final script URL location directly from components of the passed in path as opposed to solely from the sanitized output of the path verification step. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 1.76%
Percentil entre todas las CVEs puntuadas: 77
Fecha de la puntuación: 7/10/2026

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).

Tecnologías afectadas (6)

Canonical — Ubuntu Linux Debian — Debian Linux Fedoraproject — Fedora Libreoffice — Libreoffice Opensuse — Leap Redhat — Enterprise Linux

CWE

CWE-22

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-9854",
  "cveTags": [],
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          "integrityImpact": "PARTIAL",
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      "description": [
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      "lang": "en",
      "value": "LibreOffice has a feature where documents can specify that pre-installed macros can be executed on various script events such as mouse-over, document-open etc. Access is intended to be restricted to scripts under the share/Scripts/python, user/Scripts/python sub-directories of the LibreOffice install. Protection was added, to address CVE-2019-9852, to avoid a directory traversal attack where scripts in arbitrary locations on the file system could be executed by employing a URL encoding attack to defeat the path verification step. However this protection could be bypassed by taking advantage of a flaw in how LibreOffice assembled the final script URL location directly from components of the passed in path as opposed to solely from the sanitized output of the path verification step. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1."
    },
    {
      "lang": "es",
      "value": "LibreOffice presenta una funcionalidad en la que los documentos pueden especificar que las macros preinstaladas puedan ser ejecutadas sobre varios eventos de script, tales como mouse-over, document-open, etc. El acceso está previsto a restringirse para scripts bajo los subdirectorios share/Scripts/python, user/Scripts/python de la instalación de LibreOffice. La protección fue agregada, para abordar el CVE-2019-9852, para evitar un ataque de salto de directorio donde puedan ser ejecutados scripts en ubicaciones arbitrarias sobre el sistema de archivos mediante el empleo de un ataque de codificación de la URL para vencer el paso de comprobación de ruta. Sin embargo, esta protección podría ser omitida tomando ventaja de un fallo en la manera en que LibreOffice ensambló la ubicación final de la URL del script directamente desde los componentes de la ruta pasada en lugar de únicamente desde la salida saneada del paso de comprobación de ruta. Este problema afecta a: Document Foundation LibreOffice versiones 6.2 anteriores a 6.2.7; versiones 6.3 anteriores a 6.3.1."
    }
  ],
  "lastModified": "2026-06-17T02:44:43.860",
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