Filippo Cavallarin disclosed a bug in the MacOS security feature Gatekeeper that allows malicious code execution on systems running the most recent version of Mojave (10.14.0) The flaw is tied to Apple Gatekeeper s support of external drives and network shares. In a proof-of-concept attack the researcher was able to couple this with a second feature automount to create an attack scenario. While there is no patch from Apple, at this time, a workaround to mitigate the vulnerability is available.
Source: https://threatpost.com/gatekeeper-bug-in-macos-mojave-allows-malware-to-execute/145124/