We have been informed about a possible scam with hotel booking: some (probably fake) travel agency contacts possible ESANN participants by phone, trying to sell hotel rooms at higher costs. Please do not give any information by phone or if you suspect any scam. The conference organization will never ask you to pay higher prices, or to pay through other means of payment, than those detailed on the ESANN web pages.
We suspect that those who are contacted could be some of the authors of papers included in the program (which is publicly available).
Please do not hesitate to report any possible scam.