West Brom went top of the Championship with their first win in the Welsh capital since 1974.
Karlan Grant opened the scoring for the unbeaten Baggies at Cardiff City Stadium against an awful home side who have now lost four straight Championship matches.
Bluebirds boss Mick McCarthy saw his team booed off at both half time and the final whistle and he was taunted by his own fans with chants of 'You're getting sacked in the morning.'
MATCH FACTS AND PLAYER RATINGS
Cardiff City (3-4-3): Phillips 6; Morrison (capt) 4, Flint 4, Nelson 3; McGuinness 5 (Moore 67, 5), Vaulks 4 (Colwill 75, 5), Pack 4, Brown 4; Bacuna 3, Collins 4 (Harris 67, 5), Giles 4
Substitutes not used: Smithies, Bagan, Ralls, Ng
Booked: Collins
West Bromwich Albion (3-4-3): Johnstone 6; Townsend 6, Bartley 6, Ajayi 7; Furlong 7, Livermore (capt) 7 (Molumby 81, 6), Mowatt 8, Reach 7; Robinson 8 (Phillips 63, 8), Hugill 7, Grant 8 (Diangana 63, 7)
Substitutes not used: Button, Kipre, Byran, Gardner-Hickman
Goals: Grant 5, Nelson 56 (OG), Mowatt 75, Phillips 82Booked: Bartley
Referee: Graham Scott 6
Star man: Karlan Grant (West Brom)
Attendance: 17,363
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Grant was the architect of the home side's misery in a dominant West Brom win as he scored a fine opener and forced Cardiff defender Curtis Nelson to put through his own net in the second half.