Key/lock security risk

[Tikki]

Hi. 

I have noticed a potential security risk for the b9 2008-2011

i have a b9 09. my work has a 2010,2009,2011. 

My key in the front door lock opens all the other cars and vice versa. 

But won't start the car due to the immobilizer.

Has any one of you tried or have the same problem.

[Gadgetman]

That's not exactly a new issue...

I once unlocked another Berlingo with my key and didn't notice anything different before the door opened and I didn't recognise the inside.
(M49 Berlingos, both red. )

Citroën has a bit of an unfortunate history of cheap, crappy locks that doesn't hold up to wear.

[3rensho]

It's not limited to PSA cars. A number of key-less entry systems are easily hackable. Same for a plethora of IoT devices. Placing convenience far above security. Who'd of thought you could block most major internet sites in the eastern half of the US by hacking a light bulb and taking out the major DNS servers.