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For what it's worth, their server can be hosted on Windows and Linux, so somebody could make a Dockerfile for it. But yeah, in any case I'd double check for any log4j like known vulnerabilities.

[1] https://github.com/ONLYOFFICE/server/tree/8f4fd3383656602115...

At least some version of it has been open source for years: https://github.com/ONLYOFFICE

Latvian? I've always thought OnlyOffice is developed in Russia.

The headquarters are in Riga, but one would be forgiven to think it is an entirely Russian enterprise if one were to just look at their GitHub org.

The Latvian entity was wholly owned by the Russian developer until 2023.