The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: libreoffice 1:6.4.7-0ubuntu0.20.04.5 In general, a standard system update will make all the necessary changes.
CVE-2022-26305, CVE-2022-26306, CVE-2022-26307
https://launchpad.net/ubuntu/+source/libreoffice/1:6.4.7-0ubuntu0.20.04.5
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