Cardiff claimed their first win over Leinster since January 2022, with scrum-half Aled Davies' try proving decisive in a rain-lashed Arms Park encounter. The hosts led 3-0 at halftime through Callum Sheedy's penalty before extending their advantage after the break despite Leinster fighting back with a converted Luke McGrath try.
Cardiff held on despite being reduced to 14 men through Jacob Beetham's yellow card, climbing to third in the URC table and moving level on points with second-placed Leinster.