  We construct static and spherically symmetric generalizations of the
Schwarzschild- and Reissner-Nordstr\"om-(Anti-)de Sitter (RN-(A)dS) black-hole
solutions in four-dimensional Einsteinian cubic gravity (ECG). The solutions
are determined by a single blackening factor which satisfies a non-linear
second-order differential equation. Interestingly, we are able to compute
independently the Hawking temperature $T$, the Wald entropy $\mathsf{S}$ and
the Abbott-Deser mass $M$ of the solutions analytically as functions of the
horizon radius and the ECG coupling constant $\lambda$. Using these we show
that the first law of black-hole mechanics is exactly satisfied. Some of the
solutions have positive specific heat, which makes them thermodynamically
stable, even in the uncharged and asymptotically flat case. Further, we claim
that, up to cubic order in curvature, ECG is the most general four-dimensional
theory of gravity which allows for non-trivial single-blackening factor
generalizations of Schwarzschild- and RN-(A)dS which reduce to the usual
Einstein gravity solutions when the corresponding higher-order couplings are
set to zero.
