In the Steiner Tree problem, the goal is to find a minimum-weight tree containing a given set of terminals in an edge-weighted graph. Given a multiway cut of size $s$, we propose a deterministic algorithm running in $2^{O(s)}\operatorname{poly}(n,b)$ time and polynomial space ($n$ vertices, non-negative $b$-bit integer weights). A multiway cut for the terminals is a set of vertices whose deletion leaves at most one terminal in each connected component. This result answers a question of Jansen and Swennenhuis (ESA 2024). Building on their component decomposition, we show that it suffices to connect the selected cut vertices together with $O(s)$ additional terminals and attach the remaining terminals by shortest paths. We use colour coding to optimize over the choice of these additional terminals.

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