West Ham scored twice in six minutes to condemn Manchester United to an eighth Premier League defeat of the season at the London Stadium.
It took 72 minutes of a drab encounter for West Ham to find the opener when Lucas Paqueta lifted the ball into Jarrod Bowen's path and the Hammers' top scorer this season bundled past Andre Onana.
Mohammed Kudus, who has scored in his last three home games for West Ham, latched onto Kobbie Mainoo's defensive error to drill into the bottom corner and double the home side's lead.
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Manchester United have won just one match out of their last five in the top flight and Erik ten Hag's side have lost more games than they have won this season across all competitions.
As a result West Ham leapfrog them into sixth place in the table as United drop to eighth.
Manchester United host unexpected title-challengers Aston Villa on Boxing Day while West Ham travel to Arsenal on Thursday 28 December.