New Delhi, May 19 -- A Mumbai man has alleged a major security flaw in the FASTag system after his existing FASTag was allegedly deactivated and replaced with a new one without his consent while his car was being transported from Mumbai to Delhi.

The allegation was made by X user Rushil, whose post has now gone viral on social media. In the post, he claimed that a transporter's driver was allegedly able to activate another FASTag linked to his vehicle using a different mobile number and personal details, without any approval from the registered owner.

"FASTag has a MASSIVE security loophole & nobody is talking about it," Rushil wrote on X.

According to Rushil, the incident took place while his vehicle was in transit between Mumbai and ...