The Magpies currently occupy tenth position after 11 games with just one win in their last six top-flight fixtures, and are pondering a third league loss of the season after going down 1-0 at home to newly-promoted West Ham on Sunday.
And the 26-year-old French midfielder recognises that, although Alan Pardew’s side has suffered from injuries and suspensions to key players like Tim Krul, Fabricio Coloccini and Cheick Tiote, they need to be better.
He told Newcastle’s official website: “It has not been bad, but it has not been good enough either.
“We have played well but we can play better than we have done. Every game has been tough and we have had a lot of injuries and suspensions.
“It seems like every game we are missing a big player for one reason or another.”
But Cabaye believes Newcastle’s fortunes will change for the better if the players stay confident and keep working hard.
“We need to keep our confidence and keep working hard,” he added.
“Because if we stop working then it will be very difficult to get up towards the top of the league again.”
Pardew’s men will be looking to capitalise on a relatively comfortable run of Premier League fixtures in the coming weeks with their next five games coming against Swansea, Southampton, Stoke City, Wigan and Fulham.