tl;dr; Upgrade to >= 6.2.6 or >= 6.0.0.

There is a cluster of issues here.

----

CVE-2019-9850 Insufficient url validation allowing LibreLogo script
execution

There was a way to encode the script url that could bypass the fix of
CVE-2019-9848
https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9850

----

CVE-2019-9851 LibreLogo global-event script execution

The fix of CVE-2019-9848 blocked execution of LibreLogo from document
script events, e.g. mouse-over, but there is another separate feature
of global script events, e.g. document-open which are also affected
https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9851

----

CVE-2019-9852 Insufficient URL encoding flaw in allowed script location
check

There was a way to encode the script url to bypasses the fix of CVE-
2018-16858 to again allow scripts in arbitrary locations on the file
system to be executed 

https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9852


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