Whenever there's a mystery, apply the scientific method to investigate it. Form a hypothesis, an experiment or test , then record the results and check if they support.

Hypothesis: CIA is hacking reporters to determine their government sources.

If we start seeing more government sources exposed, we haven't proven it but it supports the hypothesis.

Hypothesis: State election systems are being compromised for federal monitoring and control.

If we start seeing more improbable results in one direction, that is support for the hypothesis.

The CIA's primary remit is outside of their own country. If the CIA is turning their focus inward, that's actually good news for the remainder of the civilized world.