The Beijing Winter Olympics app that all Games attendees must use contains security weaknesses that leave users exposed to data breaches, analysts say.

The My2022 app will be used by athletes, audience members and media for daily Covid monitoring.

The app will also offer voice chats, file transfers and Olympic news.

But cybersecurity group Citizen Lab says the app fails to provide encryption on many of its files. China has dismissed the concerns.

Questions about the app come amid a rise in warnings about visitors' tech security ahead of the Games, which begin on 4 February.

People attending the Beijing Olympics should bring burner phones and create email accounts for their time in China, cyber security firm Internet 2.0 said on Tuesday.

Several countries have also reportedly told athletes to leave their main devices at home.

Censorship concerns

The Citizen Lab report said it had found a "censorship keywords" list built into the app, and a feature that allows people to flag other "politically sensitive" expressions.

The list of words included the names of Chinese leaders and government agencies, as well as references to the 1989 killing of pro-democracy protesters in Tiananmen Square, and the religious group Falun Gong, which is banned in China.

The analysts noted that these features and security flaws are not uncommon for apps in China but posed a risk to users nonetheless.

Analysts said the "illegal words" file appeared currently to be inactive, but it was unclear.

All visitors to the Games are required to download the app 14 days prior to their departure for China, and use it to record daily their Covid status.