Vulnerable

1. More or most likely to be exposed to the chance of being attacked or harmed, either physically or emotionally.

• Open to disclosing one's inner thoughts and feelings, acting in spite of one's instinct to self-preservation.

2. (computing) More likely to be exposed to malicious programs or viruses.

(exposed to attack): defenceless, helpless, powerless, unguarded, unprotected, weak

(exposed to attack): durable, indomitable, invincible, invulnerable, powerful, strong