Lufthansa is asking passengers to check their website regularly for updated information: https://www.lufthansa.com/de/en/flight-information. The airline is working on rebooking affected passengers onto other flights.
Lufthansa is operating routes between Helsinki and Frankfurt as well as Helsinki and München.
Update 7.11. at 12.20:
According to the website of Lufthansa, some of the flights between Helsinki and Frankfurt as well as Helsinki and München will be cancelled on Thursday 7.11. and on Friday 8.11. The flight information on Finavia's website will be updated accordingly: https://www.finavia.fi/en/airports/helsinki-airport/flights