CVE-2019-9854: Canonical Ubuntu Linux

High severity, CVSS 7.8. EPSS: 1.8% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 19.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 29 only
• Libreoffice Libreoffice: from 6.2.0, before 6.2.7 (fixed in 6.2.7); from 6.3.0, before 6.3.1 (fixed in 6.3.1)
• Opensuse Leap: version 15.0 only; version 15.1 only
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only

Published 2019-09-06. Last modified 2026-06-17.