Apple hasn’t completely fixed a weakness in Gatekeeper, its security technology that blocks harmful applications from being installed.

Patrick Wardle, director of research with Synack, said in an interview that he reverse-engineered a patch Apple released in October and found it wasn’t quite the fix he expected.

Wardle found he could still bypass Gatekeeper and install malware. He’s going public with his latest findings on Sunday at the Shmoocon security conference, which starts Friday in Washington, D.C. 

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