CVE-2021-25635

An Improper Certificate Validation vulnerability in LibreOffice allowed 
an attacker to self sign an ODF document, with a signature untrusted by 
the target, then modify it to change the signature algorithm to an 
invalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a 
valid signature issued by a trusted person


This issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.