That can be hacked or broken into; insecure, vulnerable.(adjective)
That lends itself to hacking (technical tinkering and modification); moddable.(adjective)
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Use "hackable" in a sentence
"It's a fully programmable and "hackable" Linux computer, equipped with a fast CPU, 128MB RAM, built-in WiFi, rechargeable battery, USB, Ethernet, and a small LCD with button controls."
"American voters insist that the new Democratic Congress investigates and outlaws the various means of election fraud such as hackable, paperless computer voting machines and maintains free speech on the Internet by supporting 'net-neutrality'."
"VIEW FAVORITES yahooBuzzArticleHeadline = 'Touch-screen voting isn\'t the right answer'; yahooBuzzArticleSummary = 'he key difference between touch-screen voting and the optical scanner is that only the scanned system leaves behind an actual record prepared by the voter\'s hand and therefore is not "hackable" in the event a recount is necessary."