fakruzaruret Flarum does not contain any java code, so no core feature or extension can use log4j anyway.
If you are integrating Flarum with other tools, like a log aggregator or a web firewall that's written in java, then you might want to take a look at the release notes for that other tool and see if they were impacted.
Bad actors will try those known injections everywhere online in the off chance they catch something not patched.
WordPress wouldn't be impacted either, but there's always the possibility that the value stored in WP then gets picked up by another software on the server that does use log4j.
