A sitting duck!

To be a sitting duck
someone or something vulnerable to attack, physical or verbal. 

Alludes to a duck floating on the water, not suspecting that it is the object of a hunter or predator. Typically: be ~; like ~; looking like~

• You look like a sitting duck out there. Get in here where the enemy cannot fire at you. - cible facile
• The senator was a sitting duck because of his unpopular position on school reform.