CYBER security chiefs have warned every smartphone owner to watch out for dodgy apps used by hackers to steal money.
Poorly developed apps can also be compromised by hackers exploiting weaknesses in software.
It comes as the Government sets out plans to introduce new rules to improve safety around apps.
The NCSC's Technical Director, Ian Levy, said app stores "have a responsibility to protect users and maintain their trust".
"Our threat report shows there is more for app stores to do, with cyber criminals currently using weaknesses in app stores on all types of connected devices to cause harm," he explained.
Some developers were caught not following best practice in a Government review.
There are also concerns about well-known app stores not sharing clear security requirements with developers.
The Code of Practice being proposed is not only designed to protect people using smartphone apps, but also smart devices, games consoles and TVs.
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However, the rules are only voluntary.
Cyber Security Minister, Julia Lopez, said: "Apps on our smartphones and tablets have improved our lives immensely - making it easier to bank and shop online and stay connected with friends.
"But no app should put our money and data at risk.
"That's why the Government is taking action to ensure app stores and developers raise their security standards and better protect UK consumers in the digital age."
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