tl;dr if an attacker can flip certain bits in one of the last phases of a SHA3 execution (e.g. through power glitching on a device) and can compare the result with that of a correct execution, the internal state of the function can be fully recovered. With short inputs, the whole input can be recovered. This may pose a risk for MAC protocols where the attacker might be able to reveal the secret.

Nothing to worry about outside of the hardware world.