The maintainers of LibreOffice and OpenOffice have shipped security updates to their productivity software to remediate multiple vulnerabilities that could be weaponized by malicious actors to alter documents to make them appear as if they are digitally signed by a trusted source.
The list of the three flaws is as follows —

CVE-2021-41830 / CVE-2021-25633 – Content and Macro Manipulation with
Source: Google Hacker News