Wembley Stadium organisers suspended their agreement with their usual security contractor on Friday, just one day before the FA Cup final between Chelsea and Liverpool.
A replacement company will instead be used to supply staff after the regular firm's apparently alarmingly-lax protocols were laid bare.
The suspension of the security contractor comes less than one year after chaos engulfed the Euro 2020 final between Italy and England.
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The Daily Mail were able to place an undercover reporter as a steward for the two FA Cup semi-finals - Manchester City versus Liverpool and Chelsea versus Crystal Palace - as well as the heavyweight world title fight between Tyson Fury and Dillian Whyte despite supplying false information.
Mirror Football has contacted the security firm named in the investigation for comment.
"Every contractor that we use is contractually obliged to carry out appropriate reference and background checks on anyone they recruit to work at Wembley Stadium.
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