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1) Microsoft pushed out its October round of security fixes to address 50 vulnerabilities, but one of the patches to remediate a zero-day flaw may be incomplete.

2) A bogus software update for Adobe Flash instead installs cryptomining malware.

3) Google extended new requirements to help ensure extensions built for its Chrome browser are secure.

4) State-sponsored hackers are borrowing publicly available tools to launch espionage attacks.

5) The U.S. government is rolling out two-factor authentication for website administrators.