The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04: libreoffice-core 1:6.2.5-0ubuntu0.19.04.1 Ubuntu 18.04 LTS: libreoffice-core 1:6.0.7-0ubuntu0.18.04.8 Ubuntu 16.04 LTS: libreoffice-core 1:5.1.6~rc2-0ubuntu1~xenial8 After a standard system update you need to restart LibreOffice to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4063-1
CVE-2019-9848, CVE-2019-9849
https://launchpad.net/ubuntu/+source/libreoffice/1:6.2.5-0ubuntu0.19.04.1 https://launchpad.net/ubuntu/+source/libreoffice/1:6.0.7-0ubuntu0.18.04.8 https://launchpad.net/ubuntu/+source/libreoffice/1:5.1.6~rc2-0ubuntu1~xenial8
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