Hacking Cubesat Satellites

In FastCompany,  I had mentioned the worry about them polluting space.  Here a further issue when you put so many targets up there.  I assume the threat is being carefully considered,but consider too that new hacks are constantly emerging.  and software will be updated to defend it.  Depends on the seriousness of the results of the hack. How many Cubesat Satellites are to many?

What happens when all the tiny satellites we’re shooting into space get hacked?
Hackers could shut them down—or turn them into weapons.   .... " 

Last month, SpaceX became the operator of the world’s largest active satellite constellation. As of the end of January, the company had 242 satellites orbiting the planet, with plans to launch 42,000 over the next decade. This is part of its ambitious project to provide internet access across the globe. The race to put satellites in space is on, with Amazon, U.K.-based OneWeb, and other companies chomping at the bit to place thousands of satellites in orbit in the coming months.  ... "