There may be code-compliance issues. Anyhow, having a connection to an
extension-cord behind an appliance can allow bad things to happen; for
instance, as a result of any activity that might cause plug to
partially retract.

Don't get hung up on "low-voltage" here, either. Most electrocutions
occur with 110 v ac.

To me, it's a no-brainer: either install a new outlet within reach, or
replace cord with one that will reach, and allow sufficient slack for
normal service activities.

J