The Celebrity Big Brother stars were reportedly put on lockdown on Wednesday after a TikTok star 'broke into' the house.
ITV bosses were forced to enact the emergency protocol at the new West London compound after the influencer's drone was flown into the garden.
As the drone soared over the house, Hollywood star Mickey Rourke was busy working out on a bike while former MP Michael Fabricant was also outside.
ITV producers quickly ordered all the celebrities inside the house as the drone attempted to land in the garden on the grass.
The doors to the compound were then locked and the shutters closed leaving the housemates locked inside for hours.
ITV are now 'reviewing' their security after the major breach as the drone footage was uploaded online.
The Celebrity Big Brother stars have been put on lockdown on Wednesday after a TikToker broke into the TV house
ITV bosses were forced to enact the emergency protocol at the new West London compound after a drone was flown into the garden
A source told The Sun: 'It was a major security breach. Flying a drone over the house is one thing but to be able to as good as land it in the garden meters away from the stars is terrifying.
'Michael was the first to spot the drone and pretended to shoot it down while Mickey was baffled.
'All the housemates ran to the doors to see what was happening but Big Brother quickly pulled down the shutters. Security is now being reviewed.'
TikToker @thedronemenace has since uploaded footage of the housemates looking confused as the drone hovered above them.
The account has previously filmed drone videos of other TV sets including soaps EastEnders and Coronation Street.
MailOnline have contacted ITV representatives for comment.
This isn't the first time the Big Brother house has suffered a security breach after the civilian series in 2023 reboot aired.
Despite security measures around the house, which was based at Garden Studios in North West London, a frightening security incident has allegedly already occurred.
As the drone flew into the garden filming, Hollywood star Mickey Rourke was busy working out while former MP Michael Fabricant was also outside
ITV producers quickly ordered all the celebrities inside the house as the drone attempted to land in the garden on the grass
It comes after Celebrity Big Brother viewers have blasted Daley Thompson (pictured), 66, after he made 'harsh' comments towards Danny Beard, 32, in Tuesday night's episode
The former Olympian clashed with the Drag Race UK winner in the episode in a fiery exchange - which left Danny (pictured left) questioning Daley's true intentions
According to The Sun, a YouTuber attempted to film the contestants using a drone before hacking into the show's radio system and listening in to the TV crews.
The intruder then refused to leave when confronted by security.
A TV insider told the newspaper: 'Given how popular the reboot of the show has been since launching last week, it has become clear there's a huge interest in it.
'And putting footage of attempts to access the house on social media makes it a tempting prospect.
'The message bosses want to put out is, 'Don't even bother trying — you won't succeed.'
Bosses have had to ramp up security measures in the wake of the incident to ensure the safety of the contestants and the smooth running of the show, it is claimed.
The original Big Brother house was located at Elstree Studios in Hertfordshire but was demolished in 2018 when Channel 5 axed the show.
That same year a man claimed he had also somehow hacked into their radio systems and managed to listen into crew conversations.
After spotting the man, the security team attempted to usher him away to prevent a breach, but he refused to move.
The unknown man, who continued to film surroundings, reportedly shouted: 'I will defend myself.'
Despite more staff emerging to the scene of events to witness what was going on, the man continued to stay put, arguing he was on the 'public highway' and that he was doing nothing wrong.
A Big Brother spokesman said: 'We have robust and rigorous security measures in place across our site for the safety of the Big Brother house, production team and housemates. Safety and welfare is always a priority.'
It comes after CBB viewers blasted Daley Thompson after he made 'harsh' comments towards Danny Beard in Tuesday night's episode.
The former Olympian, 66, clashed with the Drag Race UK winner, 32, in the episode in a fiery exchange - which left Danny questioning Daley's true intentions.
When Danny, who uses they/them pronouns, thought Mickey Rourke was speaking to them, Daley sarcastically chimed 'Danny, it's all about you. It's all about you Danny'.
When Danny, who uses they/them pronouns, thought Mickey Rourke was speaking to them, Daley chimed 'Danny, it's all about you. It's all about you Danny'
Reflecting on the comments, Danny said: 'I've tried to make an effort with everybody. But I heard Daley make a comment like "Oh not everything revolves around you". I don't know if I'm overthinking it because I've also seen him like looking at me a bit'
'Maybe he just finds me fascinating. Maybe he doesn't come across like this often. I mean, it's a lot. Look at the state of me. I can sense or I can feel he is a bit wary of me. And that's fine because maybe I'm also a little wary of him', they added
Fans on X were left unimpressed by Daley's 'unnecessary' comments but praised Danny for handing the situation with 'grace'
Reflecting on the comments in the diary room after, Danny said: 'I feel great. I think I've tried to make an effort with everybody.
'But I heard Daley make a comment like "Oh not everything revolves around you".
'I don't know if I'm overthinking it because I've also seen him like looking at me a bit. Maybe he just finds me fascinating.
'Maybe he doesn't come across like this often. I mean, it's a lot. Look at the state of me.
'I can sense or I can feel he is a bit wary of me. And that's fine because maybe I'm also a little wary of him.'
Fans on X were left unimpressed by Daley's 'unnecessary' comments but praised Danny for handing the situation with 'grace'.
Some wrote: 'Danny is an absolute darling. I think Daley’s comment was a bit harsh, and Danny’s response being to get to know him better is very gracious',
'He’s absolutely disgusting Danny beard is going to eat him alive. And I’m so here for it',
'I think Danny is sensitive to Daley saying 'it's not all about you'. I'd take that personally too if a stranger said that to me',
'Is Daley Thompson already starting on Danny Beard? #CBBUK',
'Sarcy comments and looks towards Danny twice in one night… I think we can all agree Daley is first to go? Yes ok? Thank you'.
Danny, whose real name is Daniel Curtis, previously made headlines after swearing on Big Brother's Late & Live last March whilst doing an impression of housemate Louis Walsh.
The incident saw the guest say the word 'c***' before immediately apologising after being informed they weren't allowed to say that on the show.
However, the incident didn't put off show bosses, who are said to have offered Danny £30,000.
Despite not being as well known as some, the source added that 'drag queens don’t come cheap'.
