  We present a novel method to realize a multi-target-qubit controlled phase
gate with one microwave photonic qubit simultaneously controlling $n-1$ target
microwave photonic qubits. This gate is implemented with $n$ microwave cavities
coupled to a superconducting flux qutrit. Each cavity hosts a microwave
photonic qubit, whose two logic states are represented by the vacuum state and
the single photon state of a single cavity mode, respectively. During the gate
operation, the qutrit remains in the ground state and thus decoherence from the
qutrit is greatly suppressed. This proposal requires only a single-step
operation and thus the gate implementation is quite simple. The gate operation
time is independent of the number of the qubits. In addition, this proposal
does not need applying classical pulse or any measurement. Numerical
simulations demonstrate that high-fidelity realization of a controlled phase
gate with one microwave photonic qubit simultaneously controlling two target
microwave photonic qubits is feasible with current circuit QED technology. The
proposal is quite general and can be applied to implement the proposed gate in
a wide range of physical systems, such as multiple microwave or optical
cavities coupled to a natural or artificial $\Lambda$-type three-level atom.
