The ad, which has appeared on websites and social media, claims the ITV show needs 200 people to start next month.
Its says no acting skills are required but promises paid work and free accommodation.
Applicants have to fill in a form giving their personal details.
Corrie have warned people not to respond to the ad.
A spokeswoman for the soap said stars such as Helen Flanagan are booked through reputable casting agents
A spokeswoman said: "We only book our extras – or walks-on – from reputable casting agents so they are the people to contact for any extras work.
"These ads are fake and people should not be taken in by them."
But dozens of people have already applied to the advert hoping for a taste of stardom.
One fan wrote: "I've done work as an extra a few times This is such a wonderful opportunity! Acting is my passion."
In March this year the Channel 4 soap Hollyoaks was also the subject of a fake advert which asked for 500 extras.
Lime Pictures, the production company behind the show, said at the time. "Any companies or social media accounts that advertise any such initiatives are doing so without our consent or authorisation.
"We urge people to be responsible and to not provide any personal information or contact details to these companies and accounts."